| Article | Signals | Class | Rule |
| R (complexity) | S1,S3,S5,S6,S8 | Stub | strong |
| R (programming language) | S2,S3,S8,S9 | B | strong |
| R Foundation for Statistical Computing | S2,S3,S9 | Start | strong |
| R package | S2,S8 | B | strong |
| R score | S2 | Start | strong |
| R v Adams | S2 | Start | strong |
| R-algebroid | S1,S5,S6,S9 | Start | strong |
| R-Ladies | S2,S3 | C | strong |
| R-matrix | S1,S6,S8,S9 | Start | strong |
| R. Catesby Taliaferro | S2 | Stub | strong |
| R. Duncan Luce | S2,S6,S8,S9 | Start | strong |
| R. H. Bing | S1,S8,S9 | Start | strong |
| R. H. Bruck | S1,S6,S9 | Start | strong |
| R. H. Jude | S1,S3 | C | strong |
| R. K. Rubugunday | S1 | Stub | strong |
| R. Keith Dennis | S1,S9 | Start | strong |
| R. L. Hudson | S1 | Stub | strong |
| R. Leonard Brooks | S1,S9 | Stub | strong |
| R. M. Wilson | S1,S6,S8,S9 | Start | strong |
| R. P. Paranjpye | S1 | C | strong |
| R. R. Rockingham Gill | S2 | Stub | strong |
| R. Tyrrell Rockafellar | S1,S2,S8,S9 | C | strong |
| R. W. H. T. Hudson | S1,S8,S9 | Stub | strong |
| Rabatment of the rectangle | S6 | | S6 near |
| Rabbit (cipher) | S2,S5,S6 | | strong |
| Rabdology | S1,S6,S9 | Start | strong |
| Rabin cryptosystem | S2,S8 | Start | strong |
| Rabin fingerprint | S2,S3,S6 | Start | strong |
| Rabin signature algorithm | S2,S5 | Start | strong |
| Rabinovich–Fabrikant equations | S1,S3,S6,S8,S9 | Stub | strong |
| Rabinowitsch trick | S1,S6 | Start | strong |
| RAC drawing | S1,S5 | Start | strong |
| Racah polynomials | S1,S4,S5,S6,S8 | Stub | strong |
| Racah W-coefficient | S1,S5,S6 | Start | strong |
| Race and ethnicity in censuses | S2 | B | strong |
| Race and ethnicity in the United States | S2 | B | strong |
| Race-norming | S2 | Start | strong |
| Racetrack principle | S1,S6 | Start | strong |
| Rachel Blodgett Adams | S1 | C | strong |
| Rachel Fewster | S2 | Start | strong |
| Rachel Hilliam | S2 | Start | strong |
| Rachel Justine Pries | S1 | Start | strong |
| Rachel Kuske | S1 | Start | strong |
| Rachel M. Harter | S2,S8 | Start | strong |
| Rachel Roberts (mathematician) | S1 | Stub | strong |
| Rachel Ward (mathematician) | S1,S8,S9 | Stub | strong |
| Racks and quandles | S1,S4,S5,S6,S8,S9 | Start | strong |
| Radar chart | S1,S2,S3,S8,S9 | C | strong |
| Radar cross section | S3,S4 | Start | strong |
| Rademacher | S4 | | strong |
| Rademacher complexity | S1,S2,S5,S6,S8 | Start | strong |
| Rademacher distribution | S1,S2,S5 | Start | strong |
| Rademacher system | S1,S4,S5,S6,S9 | Stub | strong |
| Rademacher's theorem | S1,S5,S6,S8,S9 | Start | strong |
| Rademacher–Menchov theorem | S1,S5,S6,S9 | Start | strong |
| Rader | S4 | | strong |
| Rader's FFT algorithm | S1,S5,S6,S8 | Start | strong |
| Radha Charan Gupta | S1,S9 | Start | strong |
| Radha Kessar | S1,S9 | Start | strong |
| Radial basis function | S1,S4,S6,S8,S9 | Start | strong |
| Radial basis function interpolation | S4,S6,S9 | | strong |
| Radial basis function network | S1,S2,S6,S9 | C | strong |
| Radial distribution function | S3,S4,S6,S9 | C | strong |
| Radial function | S1,S5,S6,S9 | Start | strong |
| Radial set | S1,S5,S6,S8,S9 | Stub | strong |
| Radial tree | S2 | Start | strong |
| Radially unbounded function | S1,S6 | Stub | strong |
| Radian | S1,S5,S6,S8 | C | strong |
| Radian per second | S1,S3 | Start | strong |
| Radiative forcing | S4 | | strong |
| Radiative transfer | S3,S4,S6 | Start | strong |
| Radical axis | S1,S4,S5,S6,S8,S9 | C | strong |
| Radical extension | S1,S4,S6,S8,S9 | Start | strong |
| Radical of a Lie algebra | S1,S4,S5,S8,S9 | Start | strong |
| Radical of a module | S1,S4,S6,S8,S9 | Stub | strong |
| Radical of a ring | S1,S4,S6,S9 | Start | strong |
| Radical of an algebraic group | S1,S6,S8,S9 | Stub | strong |
| Radical of an ideal | S1,S4,S5,S6,S8,S9 | Start | strong |
| Radical of an integer | S1,S5,S6,S8,S9 | Start | strong |
| Radical polynomial | S1,S6 | Stub | strong |
| Radical symbol | S1,S5,S6,S8,S9 | C | strong |
| Radicial morphism | S1,S8 | Stub | strong |
| Radio coloring | S1,S5,S6,S9 | Start | strong |
| Radio-frequency engineering | S1 | | strong |
| Radiodrome | S1,S6,S9 | Start | strong |
| RadioGatún | S2,S9 | C | strong |
| Radiosity (radiometry) | S3,S4,S6 | Start | strong |
| Radius | S1,S5,S8 | C | strong |
| Radius of convergence | S1,S4,S5,S6,S8,S9 | B | strong |
| Radius of curvature | S1,S5,S6,S8,S9 | Start | strong |
| Radivoj Kašanin | S1 | Start | strong |
| Radix | S1,S5,S6,S8,S9 | Start | strong |
| Rado graph | S1,S4,S5,S6,S8 | GA | strong |
| Rado's theorem (Ramsey theory) | S1,S5,S6,S9 | Start | strong |
| Radon | S4 | | strong |
| Radon measure | S1,S4,S5,S6,S8,S9 | C | strong |
| Radon transform | S1,S4,S5,S6,S8,S9 | Start | strong |
| Radon's theorem | S1,S5,S6,S8,S9 | Start | strong |
| Radonifying operator | S1,S6,S9 | Start | strong |
| Radon–Nikodym set | S1,S5,S6 | Start | strong |
| Radon–Nikodym theorem | S1,S4,S5,S6,S8,S9 | C | strong |
| Radon–Riesz property | S1,S5,S6 | Stub | strong |
| Radoslav Harman | S1 | Stub | strong |
| Radu I. Boț | S1 | Start | strong |
| Radó's theorem (harmonic functions) | S1,S5,S6,S8 | Stub | strong |
| Radó's theorem (Riemann surfaces) | S1,S5,S6,S9 | Stub | strong |
| Raegan Higgins | S1 | Start | strong |
| Rafael Artzy | S1,S8,S9 | Start | strong |
| Rafael Bombelli | S1,S8,S9 | Start | strong |
| Rafe Mazzeo | S1 | Start | strong |
| Raghavan Narasimhan | S1,S8,S9 | Stub | strong |
| Raghunatha Shiromani | S2,S6,S8 | Stub | strong |
| Ragni Piene | S1,S8,S9 | Start | strong |
| Ragsdale conjecture | S1,S5,S6,S8,S9 | Start | strong |
| Rahmat Ali Rahmat | S1,S8 | C | strong |
| Rahul Pandharipande | S1,S5,S8,S9 | Stub | strong |
| Raikov's theorem | S2,S5,S6,S8,S9 | Stub | strong |
| Rail fence cipher | S2 | Start | strong |
| Rainbow | S3,S4 | C | strong |
| Rainbow coloring | S1,S5,S6 | C | strong |
| Rainbow matching | S1,S3,S6,S9 | Start | strong |
| Rainbow table | S2,S6,S9 | C | strong |
| Rainbow-independent set | S6,S9 | | S6 near |
| Rainer Burkard | S1,S9 | Start | strong |
| Raised cosine distribution | S1,S2,S5 | Start | strong |
| Raj Chandra Bose | S1,S2,S5,S6,S8,S9 | Start | strong |
| Rajaditya (mathematician) | S1 | Start | strong |
| Rajagopalan Parthasarathy | S1,S8,S9 | Stub | strong |
| Rajat Subhra Hazra | S1,S9 | Start | strong |
| Rajchman measure | S1,S4,S5,S6 | Stub | strong |
| Rajeev Motwani | S1,S8,S9 | C | strong |
| Rajeeva Laxman Karandikar | S1,S9 | Stub | strong |
| Rajendra Bhatia | S1,S8,S9 | Stub | strong |
| Rajesh Kasturirangan | S1 | Stub | strong |
| Rajesh Shukla (statistician) | S2 | Start | strong |
| Rajeshwari Sundaram | S2,S8 | Start | strong |
| Rake (angle) | S1,S6,S8 | List | strong |
| Raking | S1,S2,S6 | Stub | strong |
| Raleigh plot | S2 | C | strong |
| Ralf J. Spatzier | S1,S8,S9 | Stub | strong |
| Ralf Seppelt | S1 | C | strong |
| Ralph A. Bradley | S2,S8,S9 | Start | strong |
| Ralph Abraham (mathematician) | S1,S8,S9 | Start | strong |
| Ralph B. D'Agostino | S2,S8 | Stub | strong |
| Ralph Ernest Powers | S1,S8 | Stub | strong |
| Ralph Fox | S1,S5,S8,S9 | Start | strong |
| Ralph Gordon Stanton | S1,S8,S9 | Start | strong |
| Ralph Greatorex | S1 | C | strong |
| Ralph Greenberg | S1,S8,S9 | Stub | strong |
| Ralph Grimaldi | S1,S9 | Stub | strong |
| Ralph Johnson (philosopher) | S2 | C | strong |
| Ralph Kaufmann | S1,S5,S8,S9 | C | strong |
| Ralph Kenna | S1,S3 | Start | strong |
| Ralph Lent Jeffery | S1 | C | strong |
| Ralph Louis Cohen | S1,S8,S9 | Start | strong |
| Ralph McKenzie | S1,S9 | Stub | strong |
| Ralph Merkle | S2,S3,S9 | C | strong |
| Ralph P. Boas Jr. | S1,S6,S8,S9 | Start | strong |
| Ralph Palmer Agnew | S1 | Stub | strong |
| Ralph S. Phillips | S1,S8,S9 | Start | strong |
| Ralucca Gera | S1,S8,S9 | Start | strong |
| Ram Kishore Saxena | S1 | Stub | strong |
| Ram Prakash Bambah | S1,S9 | Stub | strong |
| Rama Cont | S1,S8,S9 | Start | strong |
| Ramachandran Balasubramanian | S1,S8,S9 | Stub | strong |
| Ramaiyengar Sridharan | S1,S8,S9 | Stub | strong |
| Raman Parimala | S1,S8,S9 | Start | strong |
| Ramanathan Gnanadesikan | S2,S8 | Stub | strong |
| Ramanujam vanishing theorem | S1,S5,S6,S8,S9 | Stub | strong |
| Ramanujam–Samuel theorem | S1,S5,S6,S9 | Stub | strong |
| Ramanujan graph | S1,S3,S6,S8,S9 | Stub | strong |
| Ramanujan Institute for Advanced Study in Mathematics | S1,S8,S9 | Start | strong |
| Ramanujan machine | S1,S3,S8,S9 | Start | strong |
| Ramanujan Math Park | S1,S8,S9 | Start | strong |
| Ramanujan prime | S1,S5,S6,S8,S9 | Start | strong |
| Ramanujan summation | S1,S4,S5,S6,S8 | Start | strong |
| Ramanujan tau function | S1,S4,S5,S6,S8,S9 | Start | strong |
| Ramanujan theta function | S1,S4,S5,S6,S8,S9 | Stub | strong |
| Ramanujan's congruences | S1,S5,S6,S8,S9 | Start | strong |
| Ramanujan's lost notebook | S1,S6,S8,S9 | Start | strong |
| Ramanujan's master theorem | S1,S5,S6,S8,S9 | B | strong |
| Ramanujan's sum | S1,S5,S6,S8,S9 | C | strong |
| Ramanujan's ternary quadratic form | S1,S5,S6,S8,S9 | Start | strong |
| Ramanujan–Nagell equation | S1,S5,S6,S8,S9 | Start | strong |
| Ramanujan–Petersson conjecture | S1,S4,S5,S6,S8,S9 | C | strong |
| Ramanujan–Sato series | S1,S4,S5,S6,S8,S9 | C | strong |
| Ramanujan–Soldner constant | S1,S5,S6,S8,S9 | Stub | strong |
| Ramaswamy S. Vaidyanathaswamy | S1,S8,S9 | Stub | strong |
| Rambutan (cryptography) | S2,S6 | Stub | strong |
| Ramchundra | S1,S8 | Start | strong |
| Ramdas L. Bhirud | S1,S8 | Stub | strong |
| Rami Grossberg | S1,S5,S8,S9 | Stub | strong |
| Ramification (mathematics) | S1,S4,S6,S8,S9 | C | strong |
| Ramification group | S1,S4,S5,S6,S8,S9 | Start | strong |
| Ramified forcing | S1,S6 | Stub | strong |
| Ramin Takloo-Bighash | S1,S8,S9 | Stub | strong |
| Ramiro Rampinelli | S1,S3,S8 | C | strong |
| Ramism | S2,S6,S8 | B | strong |
| Ramiz Aliguliyev | S1,S3 | Start | strong |
| Ramon E. Moore | S1,S9 | C | strong |
| Ramon Llull | S2,S9 | B | strong |
| Ramon Picarte Mujica | S1 | C | strong |
| Ramp function | S1,S5,S6,S8,S9 | Start | strong |
| Ramsey cardinal | S1,S5,S6,S8,S9 | Stub | strong |
| Ramsey class | S1,S6 | Stub | strong |
| Ramsey problem | S4,S6 | | strong |
| Ramsey RESET test | S2,S5 | Stub | strong |
| Ramsey sentence | S2,S8 | C | strong |
| Ramsey test | S2,S8,S9 | C | strong |
| Ramsey theory | S1,S4,S5,S6,S8 | Start | strong |
| Ramsey's theorem | S1,S5,S6,S8,S9 | B | strong |
| Ramsey-Turán theory | S1,S6 | Start | strong |
| Ramsey–Cass–Koopmans model | S4,S5,S6,S8,S9 | | strong |
| Ramón Verea | S1 | Stub | strong |
| Ran space | S1,S5,S6,S8,S9 | Start | strong |
| Ranald Roderick Macdonald | S1 | Stub | strong |
| Rand index | S2,S9 | Start | strong |
| Randall Dougherty | S1,S9 | Stub | strong |
| Randall–Sundrum model | S3,S4,S5 | Start | strong |
| Randić index | S4,S5,S6,S9 | | strong |
| Random algebra | S1,S6,S8,S9 | Stub | strong |
| Random assignment | S2,S8 | Start | strong |
| Random band matrix | S1,S3,S6 | Stub | strong |
| Random binary tree | S1,S3,S9 | GA | strong |
| Random closed set | S1,S6 | Start | strong |
| Random cluster model | S2,S3,S4,S5,S6,S9 | C | strong |
| Random compact set | S2,S3,S6,S8,S9 | Start | strong |
| Random coordinate descent | S1,S8 | Start | strong |
| Random dynamical system | S1,S3,S4,S6,S9 | Start | strong |
| Random effects model | S2,S8,S9 | Start | strong |
| Random element | S1,S2,S5,S8,S9 | C | strong |
| Random energy model | S3,S4,S6 | Start | strong |
| Random Fibonacci sequence | S1,S5,S6,S8,S9 | Start | strong |
| Random field | S1,S2,S5 | Start | strong |
| Random forest | S2,S5,S6,S8,S9 | C | strong |
| Random generalized Lotka–Volterra model | S3,S6 | B | S6 near |
| Random geometric graph | S1,S3,S6,S9 | Stub | strong |
| Random graph | S1,S2,S4,S5,S6,S8,S9 | C | strong |
| Random graph theory of gelation | S6,S9 | | S6 near |
| Random group | S1,S4,S6,S9 | Start | strong |
| Random indexing | S2 | Stub | strong |
| Random matrix | S1,S2,S3,S4,S5,S6,S8,S9 | C | strong |
| Random measure | S2,S6 | Stub | strong |
| Random minimum spanning tree | S1,S6,S9 | Stub | strong |
| Random modulation | S2 | Stub | strong |
| Random number | S1,S2,S5,S6 | Start | strong |
| Random number book | S2,S6 | Stub | strong |
| Random number generation | S2,S3,S6 | B | strong |
| Random number generator attack | S2,S6 | C | strong |
| Random number table | S1,S6 | Start | strong |
| Random optimization | S1,S3,S6,S8 | Start | strong |
| Random oracle | S2,S4,S6,S9 | Start | strong |
| Random permutation statistics | S2,S6,S9 | Start | strong |
| Random polytope | S1,S6 | C | strong |
| Random projection | S1,S2,S9 | Start | strong |
| Random recursive tree | S2,S6,S9 | Start | strong |
| Random regular graph | S1,S2,S6 | Start | strong |
| Random sample consensus | S2,S6,S9 | C | strong |
| Random search | S1,S3,S6,S8 | Start | strong |
| Random self-reducibility | S2 | B | strong |
| Random sequence | S2,S5,S6,S8,S9 | Start | strong |
| Random sequential adsorption | S1 | Start | strong |
| Random surfing model | S1,S3,S6 | Start | strong |
| Random tree | S1,S2,S6,S9 | List | strong |
| Random utility model | S1,S5 | C | strong |
| Random variable | S1,S2,S4,S5,S8,S9 | B | strong |
| Random vibration | S4 | | strong |
| Random walk | S1,S2,S4,S5,S8 | C | strong |
| Random walk closeness centrality | S1,S2,S6 | Start | strong |
| Random walk hypothesis | S2 | B | strong |
| Random-access machine | S3,S4 | C | strong |
| Randomised decision rule | S2,S6 | Start | strong |
| Randomised non-comparative trial | S2 | Start | strong |
| Randomization | S2,S4,S6,S8 | Start | strong |
| Randomized algorithm | S1,S3,S4,S8,S9 | C | strong |
| Randomized controlled trial | S2,S8,S9 | B | strong |
| Randomized experiment | S2,S8 | Start | strong |
| Randomized response | S1,S2 | Start | strong |
| Randomness | S1,S2,S6,S8,S9 | B | strong |
| Randomness extractor | S1,S2,S6 | Start | strong |
| Randomness test | S1,S2,S6,S9 | Start | strong |
| Ranee Brylinski | S1,S9 | Start | strong |
| Range (statistics) | S2,S5,S8,S9 | Start | strong |
| Range of a function | S1,S4,S5,S6,S8,S9 | C | strong |
| Ranjan Roy | S1,S9 | Start | strong |
| Rank (differential topology) | S1,S6,S9 | Start | strong |
| Rank (graph theory) | S1,S6,S9 | Start | strong |
| Rank (linear algebra) | S1,S4,S5,S6,S8,S9 | C | strong |
| Rank 3 permutation group | S1,S6 | C | strong |
| Rank abundance curve | S2 | Stub | strong |
| Rank correlation | S1,S2,S6,S8,S9 | Start | strong |
| Rank factorization | S1,S5,S6,S9 | Start | strong |
| Rank mobility index | S2,S6 | Stub | strong |
| Rank of a group | S1,S5,S6,S9 | Start | strong |
| Rank of a partition | S1,S6,S9 | C | strong |
| Rank of an abelian group | S1,S4,S6,S8,S9 | Start | strong |
| Rank of an elliptic curve | S1,S6,S8,S9 | Start | strong |
| Rank product | S2 | Start | strong |
| Rank ring | S1,S6 | Stub | strong |
| Rank-finiteness | S1,S6 | Start | strong |
| Rank-index method | S6 | | S6 near |
| Rank-into-rank | S1,S6,S8 | Stub | strong |
| Rank-maximal allocation | S1,S3,S6,S9 | Start | strong |
| Ranked poset | S1,S6,S9 | Stub | strong |
| Rankine cycle | S3,S4 | C | strong |
| Rankine vortex | S3,S4,S5,S6 | Start | strong |
| Rankine–Hugoniot conditions | S3,S4,S6,S9 | Start | strong |
| Ranking | S1,S2,S6,S9 | Start | strong |
| Ranking (statistics) | S2,S8,S9 | Start | strong |
| Ranking SVM | S2 | C | strong |
| Rankin–Cohen bracket | S1,S5,S6 | Start | strong |
| Rankin–Selberg method | S1,S5,S6,S9 | Start | strong |
| Rankit | S1,S2,S9 | Start | strong |
| Ranklet | S1,S2,S6 | Stub | strong |
| Rank–nullity theorem | S1,S4,S5,S6,S8,S9 | C | strong |
| Rank–size distribution | S1,S2,S9 | Start | strong |
| Ranthony Edmonds | S1 | Start | strong |
| Raoul Bott | S1,S5,S8,S9 | C | strong |
| Raoul Bricard | S1,S8,S9 | Stub | strong |
| Rao–Blackwell theorem | S2,S4,S5,S6,S8,S9 | B | strong |
| Rao–Sandelius shuffle | S1,S2,S3,S6 | Start | strong |
| Rape statistics | S2 | C | strong |
| Raphael Debono | S2 | Stub | strong |
| Raphael Høegh-Krohn | S1,S8,S9 | Stub | strong |
| Raphael Levi Hannover | S1,S8 | Stub | strong |
| Raphael M. Robinson | S2,S8,S9 | Start | strong |
| Raphael Weldon | S1,S2,S8,S9 | Start | strong |
| Raphael Yuster | S1,S9 | Start | strong |
| Raphaèle Herbin | S1 | Stub | strong |
| Raphaël Cerf | S1,S8,S9 | Stub | strong |
| Raphaël Rouquier | S1,S5,S8,S9 | Start | strong |
| Rapidity | S3,S4,S5,S8,S9 | C | strong |
| Raptor code | S4,S6 | | strong |
| Raquel Prado | S2,S8 | Start | strong |
| Rare disease assumption | S2 | Start | strong |
| Rarefaction | S3,S4,S6,S9 | Stub | strong |
| Rarefied gas dynamics | S1,S3 | C | strong |
| Rarita–Schwinger equation | S1,S3,S5,S6,S8,S9 | Start | strong |
| Rasch model | S2,S4,S6,S9 | C | strong |
| Rasch model estimation | S2,S6 | Stub | strong |
| Rasiowa–Sikorski lemma | S1,S5,S6,S8,S9 | Start | strong |
| Rasterschlüssel 44 | S2,S5,S6 | | strong |
| Rastrigin function | S1,S5,S6,S8,S9 | Stub | strong |
| Rata Die | S6 | | S6 near |
| Ratan Shankar Mishra | S1 | B | strong |
| Ratchet effect | S6 | | S6 near |
| Rate (mathematics) | S1,S5,S6,S8 | Start | strong |
| Rate equation | S4,S8 | | strong |
| Rate function | S1,S4,S5,S6,S9 | Start | strong |
| Rate of convergence | S1,S4,S5,S6,S8,S9 | C | strong |
| Rate of natural increase | S1,S2 | Start | strong |
| Rate of reinforcement | S2,S6 | Stub | strong |
| Rate of response | S2,S6 | Stub | strong |
| Rate–distortion theory | S1,S3,S4,S6 | C | strong |
| Rathjen's psi function | S1,S6 | Stub | strong |
| Rating scale | S2,S6 | Start | strong |
| Rating scales for depression | S2,S6 | C | strong |
| Ratio | S1,S5,S6,S8,S9 | C | strong |
| Ratio distribution | S2,S5,S6,S9 | C | strong |
| Ratio estimator | S2,S6,S9 | B | strong |
| Ratio of uniforms | S2,S6 | C | strong |
| Ratio test | S1,S4,S5,S6,S8 | Start | strong |
| Rational agent | S3,S6 | Stub | S6 near |
| Rational arrival process | S1,S6,S9 | Stub | strong |
| Rational consequence relation | S1,S2,S6 | Start | strong |
| Rational dependence | S1,S3,S6,S9 | Start | strong |
| Rational difference equation | S1,S4,S6,S9 | Start | strong |
| Rational function | S1,S4,S5,S6,S8,S9 | C | strong |
| Rational homotopy theory | S1,S4,S5,S6,S8 | Start | strong |
| Rational ignorance | S2,S6 | Start | strong |
| Rational irrationality | S6 | | S6 near |
| Rational mapping | S1,S4,S5,S6,S9 | Start | strong |
| Rational monoid | S1,S6 | Start | strong |
| Rational normal curve | S1,S5,S6,S8,S9 | Start | strong |
| Rational normal scroll | S1,S6,S8,S9 | Stub | strong |
| Rational number | S1,S4,S5,S6,S8,S9 | C | strong |
| Rational point | S1,S4,S5,S6,S8,S9 | Start | strong |
| Rational quadratic covariance function | S1,S2,S6 | Stub | strong |
| Rational reciprocity law | S1,S6,S9 | Stub | strong |
| Rational reconstruction (mathematics) | S1,S6 | Start | strong |
| Rational representation | S1,S8,S9 | Stub | strong |
| Rational root theorem | S1,S4,S5,S6,S8,S9 | C | strong |
| Rational series | S1,S6,S9 | Start | strong |
| Rational set | S1 | Start | strong |
| Rational singularity | S1,S4,S5,S6,S8,S9 | Start | strong |
| Rational surface | S1,S4,S5,S6,S8,S9 | Start | strong |
| Rational thermodynamics | S3,S4,S5,S6 | Stub | strong |
| Rational variety | S1,S4,S5,S6,S8,S9 | Start | strong |
| Rationalisation (mathematics) | S1,S6,S9 | Start | strong |
| Rationality | S2,S9 | B | strong |
| Rationalizable strategy | S4,S6 | | strong |
| Rationalization (psychology) | S2 | C | strong |
| Ratnasingham Shivaji | S1 | Stub | strong |
| Ratner's theorems | S1,S3,S5,S6,S8,S9 | Start | strong |
| RATS (software) | S2 | Stub | strong |
| Rattleback | S3,S4 | B | strong |
| Rauch comparison theorem | S1,S4,S5,S8,S9 | Stub | strong |
| Rauzy fractal | S1,S5,S6,S8,S9 | Start | strong |
| Raven paradox | S2,S5,S9 | B | strong |
| Ravenel's conjectures | S1,S6,S8,S9 | Stub | strong |
| Ravi Agarwal | S1 | Start | strong |
| Ravi Vakil | S1,S5,S8,S9 | Start | strong |
| Raviart–Thomas basis functions | S1,S4,S6 | Start | strong |
| Ravindra Bapat | S1,S9 | Start | strong |
| Ravindra Khattree | S2,S8 | Start | strong |
| Ravindra Shripad Kulkarni | S1,S8,S9 | Stub | strong |
| Raw data | S2 | | strong |
| Rawson W. Rawson | S1,S9 | Start | strong |
| Ray class field | S1,S6 | Start | strong |
| Ray Kunze | S1,S8,S9 | Start | strong |
| Ray tracing (physics) | S3,S4,S5,S6,S9 | Start | strong |
| Ray transfer matrix analysis | S3,S4,S5,S6 | B | strong |
| Ray Turner (computer scientist) | S2 | Stub | strong |
| Raychaudhuri equation | S3,S4,S5,S8 | Start | strong |
| Rayleigh dissipation function | S3,S4,S6 | Stub | strong |
| Rayleigh distribution | S1,S2,S5 | C | strong |
| Rayleigh flow | S3,S4 | B | strong |
| Rayleigh mixture distribution | S2 | Start | strong |
| Rayleigh number | S3,S4,S5,S6,S8,S9 | C | strong |
| Rayleigh quotient | S1,S3,S4,S5,S6,S8,S9 | Start | strong |
| Rayleigh quotient iteration | S1,S4,S5,S6,S8,S9 | Start | strong |
| Rayleigh scattering | S3,S4,S6,S8 | B | strong |
| Rayleigh test | S2 | Stub | strong |
| Rayleigh theorem for eigenvalues | S1,S6 | C | strong |
| Rayleigh wave | S4 | | strong |
| Rayleigh's quotient in vibrations analysis | S1,S6 | Stub | strong |
| Rayleigh–Bénard convection | S3,S4,S5,S6,S8 | C | strong |
| Rayleigh–Faber–Krahn inequality | S1,S4,S6,S8,S9 | Stub | strong |
| Rayleigh–Jeans law | S3,S4,S5 | C | strong |
| Rayleigh–Plesset equation | S3,S4,S8 | Start | strong |
| Rayleigh–Ritz method | S1,S3,S4,S5,S6,S8,S9 | C | strong |
| Rayleigh–Taylor instability | S3,S4 | C | strong |
| Raymond C. Archibald | S1,S6,S8,S9 | C | strong |
| Raymond Cattell | S2,S6,S9 | C | strong |
| Raymond Flood (mathematician) | S1,S9 | Start | strong |
| Raymond J. Carroll | S2,S8,S9 | C | strong |
| Raymond Keiller Butchart | S1 | Start | strong |
| Raymond L. Johnson | S1 | Start | strong |
| Raymond Louis Wilder | S1,S8,S9 | C | strong |
| Raymond O. Wells Jr. | S1,S8,S9 | Stub | strong |
| Raymond Ogden | S1,S9 | Start | strong |
| Raymond Paley | S1,S8,S9 | Start | strong |
| Raymond Pearl | S2,S8,S9 | C | strong |
| Raymond Redheffer | S1,S8,S9 | Start | strong |
| Raymond Smullyan | S2,S5,S6,S8,S9 | Start | strong |
| Raymond Woodard Brink | S1,S9 | Stub | strong |
| Raymundo Favila | S1 | Stub | strong |
| Raynaud surface | S1,S8,S9 | Stub | strong |
| Raynaud's isogeny theorem | S1,S5,S6 | Stub | strong |
| Rayo's number | S1,S6,S8,S9 | Start | strong |
| Raúl Rojas | S1 | Start | strong |
| RC algorithm | S2,S5,S6 | List | strong |
| RC2 | S2,S5 | Start | strong |
| RC4 | S2,S5,S6,S8 | B | strong |
| RC5 | S2 | Start | strong |
| RC6 | S2,S5 | Start | strong |
| RE (complexity) | S1,S5,S6,S8 | Start | strong |
| Reach (mathematics) | S1,S6 | Stub | strong |
| Reachability | S1,S4,S5,S6,S8 | C | strong |
| Reaction–diffusion system | S1,S3,S4,S5,S6,S8,S9 | B | strong |
| Read's conjecture | S1,S5,S6,S9 | Stub | strong |
| Read-only Turing machine | S1,S6,S8 | Start | strong |
| Real algebraic geometry | S1,S4,S5,S6,S8,S9 | Start | strong |
| Real analysis | S1,S5,S6,S8,S9 | C | strong |
| Real analytic Eisenstein series | S1,S5,S6,S8,S9 | Start | strong |
| Real closed field | S1,S4,S5,S8 | Start | strong |
| Real closed ring | S1,S6,S9 | B | strong |
| Real computation | S1,S6,S8,S9 | Stub | strong |
| Real coordinate space | S1,S6,S8,S9 | C | strong |
| Real element | S1,S5,S6,S8 | Start | strong |
| Real form (Lie theory) | S1,S4,S5,S8,S9 | Start | strong |
| Real hyperelliptic curve | S1 | Start | strong |
| Real number | S1,S4,S5,S6,S8,S9 | C | strong |
| Real plane curve | S1,S6,S9 | Stub | strong |
| Real point | S1,S5,S6,S9 | Stub | strong |
| Real projective line | S1,S5,S6,S8,S9 | B | strong |
| Real projective plane | S1,S4,S5,S6,S8,S9 | C | strong |
| Real projective space | S1,S4,S5,S6,S8,S9 | C | strong |
| Real radical | S1,S6 | Start | strong |
| Real rank (C*-algebras) | S1,S5,S6,S9 | Start | strong |
| Real representation | S1,S6,S8 | Start | strong |
| Real structure | S1,S5,S6,S9 | Start | strong |
| Real tree | S1,S6,S8,S9 | Start | strong |
| Real-root isolation | S1,S6,S9 | Start | strong |
| Real-time Delphi | S2 | Start | strong |
| Real-valued function | S1,S5,S6,S8,S9 | Start | strong |
| Realcompact space | S1,S6,S9 | Start | strong |
| Realizability | S1,S4,S5,S6,S8,S9 | Stub | strong |
| Realization (probability) | S1,S2,S5,S6,S8,S9 | Start | strong |
| Realization (systems) | S1,S3,S4,S6 | Start | strong |
| Realized variance | S2,S6,S9 | Start | strong |
| Rearrangement inequality | S1,S4,S5,S6,S8,S9 | Start | strong |
| Reason | S2,S8,S9 | C | strong |
| Reason (argument) | S2 | Start | strong |
| Reasonable doubt | S2 | C | strong |
| Reasoning system | S6,S9 | | S6 near |
| Rebeca Guber | S1 | C | strong |
| Rebecca A. Herb | S1,S9 | Stub | strong |
| Rebecca Andridge | S2,S8 | Start | strong |
| Rebecca Betensky | S2,S8 | Start | strong |
| Rebecca Goldin | S1,S8,S9 | Start | strong |
| Rebecca Killick | S2 | Start | strong |
| Rebecca Waldecker | S1 | Start | strong |
| Rebecca Walo Omana | S1 | Start | strong |
| Rebecca Willett | S2,S3 | Stub | strong |
| Recall bias | S2 | Start | strong |
| Recamán's sequence | S1,S5,S6,S8,S9 | Start | strong |
| Receiver function | S4 | | strong |
| Receiver operating characteristic | S2,S6,S8,S9 | B | strong |
| Reception and criticism of WhatsApp security and privacy features | S2 | C | strong |
| Recession cone | S1,S9 | Start | strong |
| Reciprocal distribution | S2,S5 | Start | strong |
| Reciprocal Fibonacci constant | S1,S5,S6,S8,S9 | Stub | strong |
| Reciprocal gamma function | S1,S4,S5,S6,S9 | Start | strong |
| Reciprocal lattice | S3,S4,S6,S9 | Start | strong |
| Reciprocal polynomial | S1,S5,S6 | Start | strong |
| Reciprocal rule | S1,S4,S5,S6,S8,S9 | Stub | strong |
| Reciprocals of primes | S1,S5,S6,S8,S9 | Start | strong |
| Reciprocity (electromagnetism) | S3,S4,S8 | Start | strong |
| Reciprocity (engineering) | S6 | | S6 near |
| Reciprocity law | S1,S6,S8,S9 | C | strong |
| Recombination (cosmology) | S3,S4 | C | strong |
| Recommender system | S2,S6,S8 | B | strong |
| Reconstruction conjecture | S1,S4,S5,S6,S8,S9 | C | strong |
| Record linkage | S2 | Start | strong |
| Record value | S1 | Stub | strong |
| Recreational mathematics | S1,S5,S6,S8,S9 | Start | strong |
| Rectangle | S1,S5,S6,S8 | C | strong |
| Rectangular cuboid | S1,S5,S6 | Start | strong |
| Rectangular function | S1,S4,S5,S6,S8,S9 | C | strong |
| Rectangular lattice | S1,S3,S6,S9 | Start | strong |
| Rectangulations | S1,S6 | B | strong |
| Rectifiable set | S1,S4,S5,S6 | Start | strong |
| Rectification (geometry) | S1,S5,S6,S8,S9 | Stub | strong |
| Rectified 10-cubes | S1,S5 | Redirect | strong |
| Rectified 120-cell | S1,S5,S8,S9 | Stub | strong |
| Rectified 24-cell | S1,S5,S8,S9 | Start | strong |
| Rectified 24-cell honeycomb | S1,S5,S6,S8,S9 | B | strong |
| Rectified 5-cell | S1,S5,S8,S9 | Start | strong |
| Rectified 5-cubes | S1,S5,S8,S9 | C | strong |
| Rectified 5-orthoplexes | S1,S5,S8,S9 | Stub | strong |
| Rectified 5-simplexes | S1,S5,S8,S9 | Start | strong |
| Rectified 6-cubes | S1,S5,S8,S9 | Start | strong |
| Rectified 6-orthoplexes | S1,S5,S8,S9 | Stub | strong |
| Rectified 6-simplexes | S1,S5,S8,S9 | Start | strong |
| Rectified 600-cell | S1,S5,S8,S9 | Start | strong |
| Rectified 7-orthoplexes | S1,S5,S8,S9 | Redirect | strong |
| Rectified 7-simplexes | S1,S5,S8,S9 | Redirect | strong |
| Rectified 8-cubes | S1,S5,S8,S9 | Redirect | strong |
| Rectified 8-orthoplexes | S1,S5,S8,S9 | Redirect | strong |
| Rectified 8-simplexes | S1,S5,S8,S9 | Redirect | strong |
| Rectified 9-cubes | S1,S5 | Redirect | strong |
| Rectified Gaussian distribution | S2,S9 | Stub | strong |
| Rectified linear unit | S1,S3,S5 | | strong |
| Rectified prism | S1 | Start | strong |
| Rectified tesseract | S1,S5,S8,S9 | Start | strong |
| Rectified tesseractic honeycomb | S1,S5,S6,S8,S9 | B | strong |
| Rectified truncated cube | S1,S9 | Stub | strong |
| Rectified truncated dodecahedron | S1,S9 | Stub | strong |
| Rectified truncated icosahedron | S1,S5,S9 | Stub | strong |
| Rectified truncated octahedron | S1,S9 | Stub | strong |
| Rectified truncated tetrahedron | S1,S9 | Stub | strong |
| Rectilinear polygon | S1,S8 | C | strong |
| Rectilinear Steiner tree | S1,S6 | Start | strong |
| Recurrence period density entropy | S2,S3,S5,S6 | C | strong |
| Recurrence plot | S1,S2,S3,S5,S6,S9 | C | strong |
| Recurrence quantification analysis | S2,S3,S6,S9 | C | strong |
| Recurrence relation | S1,S4,S5,S6,S8,S9 | B | strong |
| Recurrent event analysis | S2 | C | strong |
| Recurrent neural network | S2 | C | strong |
| Recurrent point | S1,S3,S4,S6,S8,S9 | Stub | strong |
| Recurrent tensor | S1,S3,S6 | Start | strong |
| Recurrent word | S1,S6 | Stub | strong |
| Recursion | S1,S3,S6,S8 | C | strong |
| Recursion (computer science) | S1,S3,S5,S6,S8 | C | strong |
| Recursive Bayesian estimation | S2,S3,S8 | B | strong |
| Recursive definition | S1,S4,S6,S8,S9 | Start | strong |
| Recursive economics | S6,S8 | | S6 near |
| Recursive language | S1,S2,S3,S4,S6,S8 | Start | strong |
| Recursive largest first algorithm | S1,S3,S5,S6 | C | strong |
| Recursive least squares filter | S2,S4,S6,S9 | | strong |
| Recursive partitioning | S2,S6 | Start | strong |
| Recursive tree | S1,S5,S8 | Start | strong |
| Recursively enumerable language | S1,S2,S4,S6,S8,S9 | Start | strong |
| Red auxiliary number | S1,S6 | Start | strong |
| Red herring | S2,S8 | C | strong |
| Red Pike (cipher) | S2,S5 | | strong |
| Red/black concept | S2,S6 | Stub | strong |
| Redescending M-estimator | S2 | Start | strong |
| Redfield equation | S1,S3,S5 | Start | strong |
| Redheffer matrix | S1,S5,S6,S9 | Start | strong |
| Redheffer star product | S1,S3,S6,S9 | C | strong |
| Redlich–Kwong equation of state | S3,S4,S6 | Start | strong |
| REDOC | S2,S5 | Stub | strong |
| Redshift | S3,S4,S5,S6 | FA | strong |
| Redshift conjecture | S1,S6,S9 | Stub | strong |
| Redskins Rule | S2 | Start | strong |
| Reduced chi-squared statistic | S1,S2,S5,S9 | Start | strong |
| Reduced cost | S1,S8 | Start | strong |
| Reduced derivative | S6 | | S6 near |
| Reduced form | S2,S5,S6 | Start | strong |
| Reduced homology | S1,S4,S5,S6 | C | strong |
| Reduced mass | S3,S4 | Start | strong |
| Reduced product | S1,S4,S5,S6,S9 | Stub | strong |
| Reduced residue system | S1,S4,S5,S6,S9 | Stub | strong |
| Reduced ring | S1,S4,S5,S6,S8,S9 | C | strong |
| Reducing subspace | S1,S6,S8,S9 | Stub | strong |
| Reduct | S1,S6,S8,S9 | Start | strong |
| Reductio ad absurdum | S1,S2,S4,S5,S6,S8,S9 | C | strong |
| Reductio ad Hitlerum | S2 | Start | strong |
| Reduction (complexity) | S1,S3,S6,S8 | Start | strong |
| Reduction (computability theory) | S1,S5,S6,S8 | Start | strong |
| Reduction (mathematics) | S1,S5,S6,S8,S9 | Stub | strong |
| Reduction compass | S1 | Stub | strong |
| Reduction of order | S1,S4,S5,S8,S9 | Start | strong |
| Reduction of summands | S1,S6 | Stub | strong |
| Reduction strategy | S1,S3,S6,S9 | Start | strong |
| Reductive dual pair | S1,S6 | Start | strong |
| Reductive group | S1,S4,S5,S8,S9 | C | strong |
| Reductive Lie algebra | S1,S4,S5,S8,S9 | Start | strong |
| Redundant proof | S1,S6 | Start | strong |
| Red–black tree | S3,S5,S6,S8 | C | S6 near |
| Ree group | S1,S4,S5,S6,S8 | C | strong |
| Reeb foliation | S1,S4,S5,S6,S9 | Stub | strong |
| Reeb graph | S1,S5,S6 | Start | strong |
| Reeb sphere theorem | S1,S5,S6,S8,S9 | Start | strong |
| Reeb stability theorem | S1,S4,S5,S6 | Start | strong |
| Reeb vector field | S1,S4,S5,S6,S9 | Stub | strong |
| Reedy category | S1,S6,S8,S9 | Stub | strong |
| Reed–Frost model | S4,S5 | | strong |
| Reed–Muller code | S1,S4,S6,S8 | C | strong |
| Reed–Solomon error correction | S3,S4,S6,S8 | C | strong |
| Reeh–Schlieder theorem | S3,S4,S5,S6,S8 | Stub | strong |
| Rees algebra | S1,S4,S5,S6,S8,S9 | Start | strong |
| Rees decomposition | S1,S6,S8,S9 | Stub | strong |
| Rees factor semigroup | S1,S5,S6 | Start | strong |
| Rees matrix semigroup | S4,S5,S6,S9 | | strong |
| Reese Prosser | S1 | Stub | strong |
| Reeve tetrahedra | S1,S6 | Start | strong |
| Refactorable number | S1,S5,S6,S9 | Start | strong |
| Reference | S2,S8,S9 | C | strong |
| Reference class problem | S2,S6,S9 | Start | strong |
| Refinable function | S1,S6 | C | strong |
| Refinement (category theory) | S1,S6 | Start | strong |
| Refinement monoid | S1,S6 | Start | strong |
| Refinement type | S1,S6 | Stub | strong |
| Reflected Brownian motion | S1,S2 | Start | strong |
| Reflected entropy | S1,S3,S6 | Start | strong |
| Reflecting cardinal | S1,S6,S8,S9 | Stub | strong |
| Reflection (mathematics) | S1,S4,S5,S6,S8,S9 | Start | strong |
| Reflection formula | S1,S4,S5,S6,S8,S9 | Start | strong |
| Reflection group | S1,S5,S6,S8 | Start | strong |
| Reflection principle | S1,S5,S6,S8,S9 | Start | strong |
| Reflection principle (Wiener process) | S1,S3,S4,S6,S9 | Start | strong |
| Reflection seismology | S4 | | strong |
| Reflection symmetry | S1,S6,S8,S9 | Start | strong |
| Reflection theorem | S1,S5,S6,S8,S9 | Start | strong |
| Reflective subcategory | S1,S4,S5,S6 | Start | strong |
| Reflector (cipher machine) | S2 | Stub | strong |
| Reflexive closure | S1,S5,S6,S8,S9 | Stub | strong |
| Reflexive operator algebra | S4,S6,S8,S9 | | strong |
| Reflexive relation | S1,S4,S5,S8 | Start | strong |
| Reflexive sheaf | S1,S6,S8,S9 | Stub | strong |
| Reflexive space | S1,S4,S5,S6,S8,S9 | B | strong |
| Reform mathematics | S1,S6,S9 | B | strong |
| Refractive index | S3,S4,S5,S8 | B | strong |
| Regenerative process | S1,S2 | C | strong |
| Regev's theorem | S1,S5,S6,S8 | Stub | strong |
| Regge calculus | S3,S4,S5,S6,S8,S9 | Start | strong |
| Regina (program) | S1,S6,S9 | Start | strong |
| Regina Liu | S2,S8,S9 | Stub | strong |
| Regina Loewenstein | S2,S8 | Start | strong |
| Regina Nuzzo | S2,S9 | Start | strong |
| Regina S. Burachik | S1,S8,S9 | Stub | strong |
| Regina Tyshkevich | S1,S5,S9 | Start | strong |
| Regiomontanus | S1,S8,S9 | C | strong |
| Regiomontanus' angle maximization problem | S1,S5,S6,S8,S9 | Start | strong |
| Region connection calculus | S1,S6,S9 | Start | strong |
| Regionalized variable theory | S2,S6 | Stub | strong |
| Regions of England | S2 | | strong |
| Register machine | S1,S4,S5,S6,S8 | B | strong |
| Regnal number | S6 | | S6 near |
| Regression analysis | S1,S2,S5,S6,S8,S9 | C | strong |
| Regression control chart | S2 | Stub | strong |
| Regression diagnostic | S2 | Stub | strong |
| Regression dilution | S2 | C | strong |
| Regression discontinuity design | S2,S6,S8,S9 | C | strong |
| Regression fallacy | S2,S9 | Start | strong |
| Regression toward the mean | S1,S2,S5,S6,S9 | C | strong |
| Regression validation | S2,S8,S9 | Start | strong |
| Regression-kriging | S2,S6 | C | strong |
| Regressive discrete Fourier series | S1,S6,S8 | Start | strong |
| Regret (decision theory) | S2,S5,S6 | C | strong |
| Regula falsi | S1,S4,S5,S6,S8 | C | strong |
| Regular 4-polytope | S1,S5,S8,S9 | Start | strong |
| Regular cardinal | S1,S4,S5,S6,S8,S9 | Start | strong |
| Regular category | S1,S4,S5,S6,S8,S9 | C | strong |
| Regular chain | S3,S4,S6,S8,S9 | | strong |
| Regular complex polygon | S1,S9 | C | strong |
| Regular conditional probability | S1,S4,S6,S8,S9 | Start | strong |
| Regular dodecahedron | S1,S5,S6,S8,S9 | C | strong |
| Regular element of a Lie algebra | S1,S8,S9 | Start | strong |
| Regular embedding | S1,S6,S8,S9 | Start | strong |
| Regular expression | S3,S4,S5,S6,S8 | B | strong |
| Regular extension | S1,S5,S8,S9 | Stub | strong |
| Regular Figures | S1,S6,S8 | C | strong |
| Regular grammar | S1,S2,S3,S6,S8 | Start | strong |
| Regular graph | S1,S4,S5,S6,S8 | Start | strong |
| Regular grid | S1,S6,S8,S9 | Start | strong |
| Regular Hadamard matrix | S1,S6,S8,S9 | Stub | strong |
| Regular homotopy | S1,S4,S5,S6,S8,S9 | Start | strong |
| Regular icosahedron | S1,S5,S6,S8,S9 | C | strong |
| Regular ideal | S1,S5,S6,S9 | Start | strong |
| Regular isotopy | S1,S5,S6,S9 | Stub | strong |
| Regular language | S1,S2,S3,S4,S5,S6,S8 | C | strong |
| Regular local ring | S1,S4,S5,S6,S8,S9 | Start | strong |
| Regular map (graph theory) | S1,S6,S8,S9 | Start | strong |
| Regular matroid | S1,S6 | Start | strong |
| Regular measure | S1,S4,S5,S6,S8 | Start | strong |
| Regular modal logic | S2,S6,S9 | Stub | strong |
| Regular number | S1,S5,S6,S8,S9 | GA | strong |
| Regular numerical predicate | S1,S3,S6 | C | strong |
| Regular octahedron | S1,S5,S6,S8,S9 | C | strong |
| Regular open set | S1,S4,S6,S8,S9 | Start | strong |
| Regular p-group | S1,S6 | Start | strong |
| Regular paperfolding sequence | S1,S6,S8 | Start | strong |
| Regular part | S1,S6 | Stub | strong |
| Regular polygon | S1,S4,S5,S8,S9 | C | strong |
| Regular polyhedron | S1,S5,S8,S9 | C | strong |
| Regular polytope | S1,S4,S5,S8,S9 | C | strong |
| Regular Polytopes (book) | S1,S8,S9 | C | strong |
| Regular prime | S1,S4,S5,S6,S8,S9 | Start | strong |
| Regular representation | S1,S4,S5,S6,S8 | Start | strong |
| Regular scheme | S1,S4,S5,S6,S8,S9 | Stub | strong |
| Regular semi-algebraic system | S3,S6 | Start | S6 near |
| Regular semigroup | S1,S4,S5,S6,S9 | Start | strong |
| Regular sequence | S1,S4,S5,S6,S8,S9 | Start | strong |
| Regular singular point | S1,S4,S5,S6,S8,S9 | Start | strong |
| Regular skew apeirohedron | S1,S8,S9 | C | strong |
| Regular skew polyhedron | S1,S5,S8,S9 | List | strong |
| Regular space | S1,S4,S5,S6,S8,S9 | Start | strong |
| Regular tetrahedron | S1,S5,S6,S8 | C | strong |
| Regular tree grammar | S2,S3,S6 | C | strong |
| Regular tuning | S1,S6 | B | strong |
| Regularity structure | S1,S4,S6,S9 | Start | strong |
| Regularity theory | S1,S6,S9 | Stub | strong |
| Regularization (mathematics) | S1,S4,S6,S9 | Start | strong |
| Regularization by spectral filtering | S1,S6 | Start | strong |
| Regularization perspectives on support vector machines | S3,S6 | Start | S6 near |
| Regularized canonical correlation analysis | S1,S6 | Stub | strong |
| Regularized least squares | S1,S2,S6,S9 | C | strong |
| Regularly ordered | S1,S6,S9 | Stub | strong |
| Regulated function | S1,S5,S6,S9 | Start | strong |
| Regulated integral | S1,S6,S8,S9 | Start | strong |
| Regulus (geometry) | S1,S5,S6,S8,S9 | Start | strong |
| Rehuel Lobatto | S1,S8,S9 | Stub | strong |
| Reidemeister move | S1,S4,S5,S8 | Start | strong |
| Reider's theorem | S1,S5,S6,S8,S9 | Stub | strong |
| Reification (fallacy) | S2 | Start | strong |
| Reification (statistics) | S2,S6 | Stub | strong |
| Reiko Sakamoto (mathematician) | S1 | Stub | strong |
| Reilly formula | S1,S6 | Start | strong |
| Reinforcement learning | S1,S2,S3,S5 | B | strong |
| Reinhard Diestel | S1,S9 | Start | strong |
| Reinhardt cardinal | S1,S6,S8 | Stub | strong |
| Reinhardt Kiehl | S1,S8,S9 | Stub | strong |
| Reinhardt polygon | S1,S8 | C | strong |
| Reinhold Baer | S1,S5,S8,S9 | C | strong |
| Reinhold Hoppe | S1,S9 | Start | strong |
| Reinhold Remmert | S1,S5,S8,S9 | Stub | strong |
| Reinhold Strassmann | S1,S8,S9 | Stub | strong |
| Reiss relation | S1,S5,S6 | Stub | strong |
| Reissner–Mindlin plate theory | S4 | | strong |
| Reissner–Nordström metric | S3,S4,S5,S8 | Start | strong |
| Rejection sampling | S2,S4,S6,S8,S9 | Start | strong |
| Rekeying (cryptography) | S2 | Stub | strong |
| Rekha R. Thomas | S1,S6,S8,S9 | Start | strong |
| Related rates | S1,S5,S6,S8,S9 | Start | strong |
| Related-key attack | S2,S6 | | strong |
| Relation (mathematics) | S1,S6,S8,S9 | C | strong |
| Relation algebra | S1,S4,S5,S6,S8,S9 | Start | strong |
| Relational algebra | S1,S2,S3,S5,S6,S8,S9 | C | strong |
| Relationship between mathematics and physics | S1,S3,S6,S8,S9 | Start | strong |
| Relationship square | S2 | Start | strong |
| Relationships among probability distributions | S2,S9 | Start | strong |
| Relative canonical model | S1,S6 | Stub | strong |
| Relative change | S2,S6,S8,S9 | Start | strong |
| Relative contact homology | S1,S6 | Start | strong |
| Relative cycle | S1,S6,S9 | Stub | strong |
| Relative dimension | S1,S5,S6,S9 | Stub | strong |
| Relative effective Cartier divisor | S1,S6,S9 | Start | strong |
| Relative homology | S1,S4,S5,S6,S8 | Start | strong |
| Relative index of inequality | S2,S6 | Start | strong |
| Relative interior | S1,S6,S9 | Stub | strong |
| Relative likelihood | S1,S2,S6,S8,S9 | C | strong |
| Relative neighborhood graph | S1,S3,S6,S9 | Start | strong |
| Relative risk | S2,S6,S9 | C | strong |
| Relative risk reduction | S2,S6,S9 | Stub | strong |
| Relative scalar | S1,S6 | Start | strong |
| Relative species abundance | S2 | B | strong |
| Relative survival | S2 | Start | strong |
| Relatively compact subspace | S1,S5,S6,S8,S9 | Start | strong |
| Relatively hyperbolic group | S1,S6,S9 | Start | strong |
| Relativist fallacy | S2 | Start | strong |
| Relativistic angular momentum | S3,S4,S6 | Start | strong |
| Relativistic Breit–Wigner distribution | S2,S3 | C | strong |
| Relativistic chaos | S1,S3,S6 | Stub | strong |
| Relativistic Doppler effect | S3,S4,S5,S8 | B | strong |
| Relativistic Euler equations | S3,S4,S5,S8 | Stub | strong |
| Relativistic Lagrangian mechanics | S3,S4,S6,S8 | C | strong |
| Relativistic mechanics | S3,S4,S5 | C | strong |
| Relativistic quantum mechanics | S1,S3,S6,S8,S9 | Start | strong |
| Relativistic system (mathematics) | S1,S6 | Start | strong |
| Relativity of simultaneity | S3,S4,S8 | B | strong |
| Relaxation (approximation) | S1,S4,S6,S8,S9 | Stub | strong |
| Relaxation (iterative method) | S1,S5,S6,S8,S9 | Stub | strong |
| Relaxation (physics) | S3,S4,S9 | C | strong |
| Relaxation oscillator | S4 | | strong |
| Relaxed intersection | S1,S3,S6 | Start | strong |
| Relay channel | S4,S6 | | strong |
| Relevance | S2,S8,S9 | C | strong |
| Relevance logic | S1,S2,S5,S6,S8,S9 | C | strong |
| Relevance vector machine | S2,S9 | Stub | strong |
| Reliability (statistics) | S2,S6,S9 | C | strong |
| Reliability block diagram | S2,S3,S6 | Stub | strong |
| Reliability engineering | S2,S3,S6,S8,S9 | C | strong |
| Reliability index | S2,S3 | C | strong |
| Reliability theory of aging and longevity | S2,S3 | Stub | strong |
| Religious pluralism | S2 | | strong |
| Religious views of Isaac Newton | S1,S3,S8 | B | strong |
| Rellich–Kondrachov theorem | S1,S4,S5,S6,S8,S9 | Start | strong |
| Remainder | S1,S5,S6,S8,S9 | C | strong |
| Remarkable cardinal | S1,S6,S8,S9 | Stub | strong |
| Remarks on the Foundations of Mathematics | S2,S9 | Start | strong |
| Remez algorithm | S1,S4,S5,S6,S8,S9 | Start | strong |
| Remez inequality | S1,S4,S5,S6,S8,S9 | Start | strong |
| Remmert–Stein theorem | S1,S4,S5,S6,S8,S9 | Stub | strong |
| Remote point | S1,S6 | Stub | strong |
| Removable singularity | S1,S4,S5,S8,S9 | Start | strong |
| Remy Denis | S1 | Start | strong |
| Rena Bakhshi | S1,S3 | Start | strong |
| Renard series | S6,S9 | | S6 near |
| Renata Mansini | S1,S6,S8 | Stub | strong |
| Renate Scheidler | S1,S9 | Start | strong |
| Renate Tobies | S1,S8,S9 | Start | strong |
| Renato Caccioppoli | S1,S8,S9 | Start | strong |
| Renaud Lambiotte | S1,S3 | Start | strong |
| Rencontres numbers | S1,S2,S5,S6,S8,S9 | Start | strong |
| Rendiconti di Matematica e delle sue Applicazioni | S1,S8,S9 | Start | strong |
| Renewal theory | S1,S2,S4,S6 | C | strong |
| Reneé H. Moore | S2,S8 | Start | strong |
| Renkonen similarity index | S2 | Stub | strong |
| Renormalization | S3,S4,S5,S6,S8,S9 | C | strong |
| Renormalization group | S3,S4,S5,S6,S8,S9 | C | strong |
| Rental harmony | S4,S6 | | strong |
| Renu C. Laskar | S1,S8,S9 | Start | strong |
| Renzo L. Ricca | S1,S9 | Start | strong |
| René Carmona | S1 | Start | strong |
| René de Possel | S1,S9 | Start | strong |
| René Descartes | S1,S4,S5,S8,S9 | B | strong |
| René Girard | S2 | C | strong |
| René Goormaghtigh | S1,S8,S9 | Stub | strong |
| René Maurice Fréchet | S1,S5,S8,S9 | C | strong |
| René Schoof | S1,S8,S9 | Stub | strong |
| René Thom | S1,S3,S5,S6,S8,S9 | C | strong |
| René-François de Sluse | S1,S8,S9 | Stub | strong |
| René-Louis Baire | S1,S8,S9 | C | strong |
| Rep-tile | S1,S5,S6,S8,S9 | C | strong |
| Reparameterization trick | S2,S6 | C | strong |
| Repdigit | S1,S5,S6,S8,S9 | Start | strong |
| Repeatability | S2,S6 | Start | strong |
| Repeated game | S1,S4,S6 | Start | strong |
| Repeated measures design | S1,S2,S6,S8,S9 | C | strong |
| Repeated median regression | S2,S6 | Stub | strong |
| Repeating decimal | S1,S4,S5,S6,S8 | C | strong |
| Repetition code | S4,S6 | | strong |
| Replacement product | S1,S5,S6,S9 | Stub | strong |
| Replay attack | S2,S6 | C | strong |
| Replica trick | S3,S4,S5,S6 | Start | strong |
| Replicate (biology) | S2 | Stub | strong |
| Replication (statistics) | S2,S5,S8,S9 | Start | strong |
| Replicator equation | S4,S5,S6,S8,S9 | | strong |
| Repopulation | S2 | Stub | strong |
| Representable functor | S1,S4,S5,S8 | B | strong |
| Representation (mathematics) | S1,S5,S6,S8,S9 | B | strong |
| Representation of a Lie group | S1,S4,S5,S8 | Start | strong |
| Representation of a Lie superalgebra | S1,S6,S8,S9 | Stub | strong |
| Representation on coordinate rings | S1,S6,S8 | Start | strong |
| Representation rigid group | S1,S6 | Stub | strong |
| Representation ring | S1,S4,S5,S6,S8,S9 | Start | strong |
| Representation theorem | S1,S5,S6,S9 | Start | strong |
| Representation theory | S1,S5,S6,S8,S9 | B | strong |
| Representation theory of diffeomorphism groups | S1,S6,S8 | Stub | strong |
| Representation theory of finite groups | S1,S5,S6,S8 | B | strong |
| Representation theory of Hopf algebras | S1,S6,S8,S9 | Start | strong |
| Representation theory of semisimple Lie algebras | S1,S4,S8,S9 | C | strong |
| Representation theory of SL2(R) | S1,S4,S8 | Start | strong |
| Representation theory of SU(2) | S1,S4,S8 | Start | strong |
| Representation theory of the Lorentz group | S1,S3,S4,S8 | GA | strong |
| Representation theory of the Poincaré group | S1,S3,S8 | Stub | strong |
| Representation theory of the symmetric group | S1,S4,S5,S6,S8,S9 | Start | strong |
| Representation up to homotopy | S1,S6 | C | strong |
| Representations of classical groups | S1,S8 | C | strong |
| Representative elementary volume | S4 | | strong |
| Representer theorem | S3,S4,S5,S6 | Start | strong |
| Reproducibility | S2,S6,S9 | C | strong |
| Reproducing kernel Hilbert space | S1,S4,S5,S6,S8,S9 | C | strong |
| Reptation | S4,S5 | | strong |
| Repunit | S1,S5,S6,S8,S9 | C | strong |
| Resampling (statistics) | S2,S5,S6,S8,S9 | C | strong |
| Rescaled range | S2,S6,S9 | Start | strong |
| Rescorla–Wagner model | S4 | | strong |
| Research design | S2 | C | strong |
| Research ethics | S2 | C | strong |
| Research Institute for Advanced Studies | S1,S3,S9 | Start | strong |
| Research Institute for Mathematical Sciences | S1,S9 | Stub | strong |
| Researcher degrees of freedom | S2 | Stub | strong |
| Resentful demoralization | S2 | Stub | strong |
| Reservoir modeling | S2,S6 | | strong |
| Reshetikhin–Turaev invariant | S1,S8 | C | strong |
| Reshetnyak gluing theorem | S1,S5,S6 | Stub | strong |
| Residence time (statistics) | S1,S2 | Start | strong |
| Residual (numerical analysis) | S1,S5,S6,S8,S9 | Stub | strong |
| Residual intersection | S1,S6 | C | strong |
| Residual neural network | S2,S3 | C | strong |
| Residual property (mathematics) | S1,S4,S6,S9 | Stub | strong |
| Residual sum of squares | S1,S2,S5 | Start | strong |
| Residual time | S2,S3,S6 | Start | strong |
| Residually finite group | S1,S4,S6,S9 | Start | strong |
| Residuated Boolean algebra | S1,S6,S8,S9 | Start | strong |
| Residuated lattice | S1,S4,S6,S9 | Start | strong |
| Residuated mapping | S1,S4,S6,S8 | Start | strong |
| Residue (complex analysis) | S1,S4,S5,S6,S8,S9 | Start | strong |
| Residue at infinity | S1,S6,S9 | Start | strong |
| Residue field | S1,S4,S5,S6,S8,S9 | C | strong |
| Residue number system | S1,S3,S6 | C | strong |
| Residue theorem | S1,S4,S5,S6,S8,S9 | Start | strong |
| Residue-class-wise affine group | S1,S6 | Stub | strong |
| Resilience (mathematics) | S1,S3,S6 | Start | strong |
| Resistance distance | S1,S3,S4,S5,S6 | Start | strong |
| Resolution (algebra) | S1,S4,S6,S8,S9 | Start | strong |
| Resolution (logic) | S1,S2,S5,S6,S8,S9 | Start | strong |
| Resolution of singularities | S1,S4,S5,S6,S8,S9 | C | strong |
| Resolution proof compression by splitting | S1,S3,S5,S6 | Start | strong |
| Resolution proof reduction via local context rewriting | S1,S6 | Start | strong |
| Resolution theorem (algebraic K-theory) | S1,S6 | Stub | strong |
| Resolvable space | S1,S6,S8 | Stub | strong |
| Resolvent (Galois theory) | S1,S4,S6,S8,S9 | Start | strong |
| Resolvent cubic | S1,S5,S6,S9 | C | strong |
| Resolvent formalism | S1,S4,S5,S6,S9 | Start | strong |
| Resolvent set | S1,S4,S5,S6,S8,S9 | Start | strong |
| Resonance | S3,S4,S6 | C | strong |
| Resonate (company) | S2 | Start | strong |
| Resource-bounded measure | S1,S3,S5,S6 | Start | strong |
| Respondent | S2 | Stub | strong |
| Respondent error | S2 | Stub | strong |
| Response bias | S2,S6 | C | strong |
| Response modeling methodology | S2,S6 | C | strong |
| Response rate (survey) | S2,S6 | Start | strong |
| Response surface methodology | S2,S4,S6,S8,S9 | Start | strong |
| Response-rate ratio | S2,S6 | Stub | strong |
| Responsive predicate | S2 | Stub | strong |
| Responsive set extension | S1,S9 | Start | strong |
| Restricted isometry property | S1,S4,S6,S9 | Start | strong |
| Restricted Lie algebra | S1,S4,S5,S6,S9 | Start | strong |
| Restricted maximum likelihood | S2,S9 | Start | strong |
| Restricted partial quotients | S1,S6 | Start | strong |
| Restricted power series | S1,S4,S5,S6,S9 | Start | strong |
| Restricted product | S1,S5,S6,S8,S9 | Stub | strong |
| Restricted randomization | S2,S8,S9 | Start | strong |
| Restricted representation | S1,S5,S6,S8,S9 | C | strong |
| Restricted root system | S1,S8,S9 | Stub | strong |
| Restricted sumset | S1,S4,S5,S6,S8,S9 | Start | strong |
| Restriction (mathematics) | S1,S4,S5,S6,S8 | C | strong |
| Restriction conjecture | S1,S4,S5,S6,S9 | Stub | strong |
| Restrictions on the import of cryptography | S2 | | strong |
| Result | S2,S9 | List | strong |
| Resultant | S1,S4,S5,S6,S8,S9 | C | strong |
| Results in Mathematics | S1,S8,S9 | Stub | strong |
| Resurgent function | S4,S5,S6 | | strong |
| Retarded potential | S3,S4,S6 | Start | strong |
| Rethinking Mathematics | S1,S6 | Stub | strong |
| Retract (group theory) | S1,S5,S6,S9 | Stub | strong |
| Retraction (topology) | S1,S4,S5,S6,S8,S9 | Start | strong |
| RetroShare | S2 | C | strong |
| Retrospective determinism | S2 | Start | strong |
| Retsef Levi | S1 | Start | strong |
| Return period | S2 | Start | strong |
| Reuben Goodstein | S1,S9 | Start | strong |
| Reuleaux polygon | S1,S8 | C | strong |
| Reuleaux tetrahedron | S1,S5,S6,S8,S9 | Start | strong |
| Reuleaux triangle | S1,S4,S5,S8 | GA | strong |
| Reuschle's theorem | S1,S5,S6,S8 | Stub | strong |
| Revaz Gamkrelidze | S1 | Stub | strong |
| Revealed preference | S4 | | strong |
| Revelation principle | S1,S4,S5,S6,S9 | Start | strong |
| Revenue equivalence | S4,S6 | | strong |
| Reverse correlation technique | S2,S6 | C | strong |
| Reverse divisible number | S1,S6 | Start | strong |
| Reverse mathematics | S1,S4,S5,S6,S8,S9 | B | strong |
| Reverse Mathematics: Proofs from the Inside Out | S1,S6 | Start | strong |
| Reverse perspective | S1 | Start | strong |
| Reverse Polish notation | S1,S5,S6,S9 | C | strong |
| Reverse-delete algorithm | S1,S3,S5,S6 | Start | strong |
| Reverse-search algorithm | S1,S6,S9 | C | strong |
| Reversed compound agent theorem | S1,S5,S6,S8 | Stub | strong |
| Reversible cellular automaton | S1,S3,S6,S8 | GA | strong |
| Reversible diffusion | S1,S5,S6 | Stub | strong |
| Reversible process (thermodynamics) | S3,S4,S6 | Start | strong |
| Reversible-jump Markov chain Monte Carlo | S2,S5,S6,S8 | Stub | strong |
| Revised simplex method | S1,S3,S4,S6 | C | strong |
| Revision theory | S2 | C | strong |
| Revista Colombiana de Estadística | S2,S8,S9 | Start | strong |
| Revolution Analytics | S2 | B | strong |
| Revolutions in Mathematics | S1,S2,S6,S9 | Start | strong |
| REVSTAT | S2,S9 | Start | strong |
| Rewrite order | S3,S6 | | S6 near |
| Rewriting | S1,S2,S3,S4,S5,S6,S8,S9 | C | strong |
| Reye configuration | S1,S5,S6,S9 | Start | strong |
| Reynolds analogy | S4,S6 | | strong |
| Reynolds decomposition | S1,S3,S4 | Start | strong |
| Reynolds equation | S4,S8 | | strong |
| Reynolds number | S3,S4,S5,S6,S8,S9 | B | strong |
| Reynolds operator | S1,S3,S5,S6,S8 | Start | strong |
| Reynolds stress | S3,S4,S6 | C | strong |
| Reynolds transport theorem | S3,S4,S5,S6,S8,S9 | Start | strong |
| Reynolds-averaged Navier–Stokes equations | S3,S4,S5,S8,S9 | Start | strong |
| Rheology | S3,S4,S8 | C | strong |
| Rheonomous | S3,S4,S6 | Start | strong |
| Rhetoric | S2,S6,S8,S9 | B | strong |
| Rhetoric (Aristotle) | S2,S8 | C | strong |
| Rhetorical reason | S2 | Start | strong |
| Rhind Mathematical Papyrus | S1,S5,S6,S8,S9 | C | strong |
| Rhode Island Math League | S1 | Stub | strong |
| Rhode Island statistical areas | S2 | List | strong |
| Rhombic dodecahedron | S1,S5,S6,S8 | C | strong |
| Rhombic enneacontahedron | S1,S5,S8 | Stub | strong |
| Rhombic hectotriadiohedron | S1,S5,S8 | Stub | strong |
| Rhombic hexecontahedron | S1,S5,S8,S9 | Stub | strong |
| Rhombic icosahedron | S1,S5,S8 | Start | strong |
| Rhombic triacontahedron | S1,S5,S6,S8 | Start | strong |
| Rhombicosacron | S1,S5,S8,S9 | Stub | strong |
| Rhombicosahedron | S1,S5,S8,S9 | Stub | strong |
| Rhombicosidodecahedron | S1,S5,S8,S9 | Start | strong |
| Rhombicuboctahedral prism | S1,S5,S8,S9 | Stub | strong |
| Rhombicuboctahedron | S1,S5,S8,S9 | B | strong |
| Rhombidodecadodecahedron | S1,S5,S8,S9 | Stub | strong |
| Rhombihexaoctagonal tiling | S1,S6,S8 | Start | strong |
| Rhombille tiling | S1,S6,S8 | Start | strong |
| Rhombipentahexagonal tiling | S1,S6,S8,S9 | Stub | strong |
| Rhombitetrahexagonal tiling | S1,S6,S8 | C | strong |
| Rhombitetrapentagonal tiling | S1,S6,S8,S9 | Start | strong |
| Rhombitriheptagonal tiling | S1,S6,S8,S9 | Stub | strong |
| Rhombitrihexagonal tiling | S1,S5,S6,S8 | Stub | strong |
| Rhombohedron | S1,S5,S8,S9 | Start | strong |
| Rhombus | S1,S5,S6,S8 | C | strong |
| Rhonda Hatcher | S1 | Start | strong |
| Rhonda Hughes | S1,S9 | Start | strong |
| Rhythm of Structure | S6,S8,S9 | | S6 near |
| Ri Jong-yol | S1 | GA | strong |
| Ribbon (mathematics) | S1,S6,S8,S9 | Start | strong |
| Ribbon category | S1,S5,S6,S8 | Start | strong |
| Ribbon graph | S1,S6,S9 | Start | strong |
| Ribbon Hopf algebra | S1,S4,S5,S9 | Stub | strong |
| Ribbon knot | S1,S5,S6,S8,S9 | Stub | strong |
| Ribenboim Prize | S1,S6,S9 | Start | strong |
| Ribet's theorem | S1,S5,S6,S8,S9 | Start | strong |
| Ricardo Baeza Rodríguez | S1,S8 | Stub | strong |
| Ricardo Cortez (mathematician) | S1 | Stub | strong |
| Riccati equation | S1,S4,S5,S8,S9 | Start | strong |
| Ricci calculus | S1,S3,S5,S6,S8,S9 | B | strong |
| Ricci curvature | S1,S3,S4,S5,S6,S8,S9 | C | strong |
| Ricci decomposition | S1,S3,S5,S6,S8,S9 | Start | strong |
| Ricci flow | S1,S4,S5,S6,S8,S9 | B | strong |
| Ricci soliton | S1 | Stub | strong |
| Ricci-flat manifold | S1,S8,S9 | Stub | strong |
| Rice | S4 | | strong |
| Rice distribution | S2,S5 | C | strong |
| Rice's formula | S1,S6 | Stub | strong |
| Rice's theorem | S1,S5,S6,S8,S9 | C | strong |
| Ricerche di Matematica | S1,S8,S9 | Stub | strong |
| Rice–Shapiro theorem | S1,S3,S5,S6,S8 | Start | strong |
| Richard A. Brualdi | S1,S6,S8,S9 | Stub | strong |
| Richard A. Parker | S1,S9 | Stub | strong |
| Richard A. Tapia | S1,S8,S9 | C | strong |
| Richard Aaron | S2 | C | strong |
| Richard Alan Wentworth | S1 | Stub | strong |
| Richard Allen Hunt | S1,S8 | Stub | strong |
| Richard Arenstorf | S1 | Stub | strong |
| Richard Arratia | S1,S6,S9 | Start | strong |
| Richard Askey | S1,S8,S9 | Start | strong |
| Richard B. McHugh | S2,S8 | Start | strong |
| Richard Balam | S1 | Stub | strong |
| Richard Baldus | S1,S8,S9 | Start | strong |
| Richard Beals (mathematician) | S1,S9 | Stub | strong |
| Richard Beez | S1 | Stub | strong |
| Richard Bellman | S1,S3,S6,S8,S9 | C | strong |
| Richard Bertram (mathematician) | S1 | Start | strong |
| Richard Borcherds | S1,S5,S8,S9 | C | strong |
| Richard Brauer | S1,S5,S8,S9 | Start | strong |
| Richard Bronson | S1 | Start | strong |
| Richard Bruce Paris | S1 | Start | strong |
| Richard C. DiPrima Prize | S1 | List | strong |
| Richard Canary | S1,S9 | Stub | strong |
| Richard Cleve | S1,S3,S8 | Stub | strong |
| Richard Courant | S1,S6,S8,S9 | Start | strong |
| Richard Crandall | S1,S3,S8 | Start | strong |
| Richard D. Gill | S1,S2,S3,S8,S9 | Start | strong |
| Richard Davis Anderson | S1,S8,S9 | Start | strong |
| Richard Dedekind | S1,S2,S5,S8,S9 | C | strong |
| Richard Delamaine | S1,S9 | Start | strong |
| Richard E. Barlow | S1,S2,S8,S9 | Start | strong |
| Richard Earl Block | S1,S8,S9 | Stub | strong |
| Richard Ehrenborg | S1,S9 | Stub | strong |
| Richard Eliot Chamberlin | S1,S8 | Start | strong |
| Richard Elman (mathematician) | S1,S8,S9 | Stub | strong |
| Richard Ernest Kronauer | S1,S3 | Stub | strong |
| Richard F. Bass | S1,S8,S9 | Stub | strong |
| Richard Ferrybridge | S2 | Stub | strong |
| Richard Feynman | S1,S3,S5,S6,S8 | FA | strong |
| Richard Fletcher (American politician) | S2,S9 | Stub | strong |
| Richard Friederich Arens | S1,S8,S9 | Stub | strong |
| Richard Gaskin | S2 | C | strong |
| Richard H. Stockbridge | S1 | Start | strong |
| Richard Hamming | S1,S3,S8,S9 | GA | strong |
| Richard Harington | S1 | Stub | strong |
| Richard Jack (mathematician) | S1 | C | strong |
| Richard Jeffrey | S2,S9 | Start | strong |
| Richard Johnsonbaugh | S1,S8,S9 | Stub | strong |
| Richard K. Guy | S1,S6,S8,S9 | C | strong |
| Richard Kadison | S1,S8,S9 | Start | strong |
| Richard Kenyon | S1,S8,S9 | Stub | strong |
| Richard L. Bishop | S1,S8,S9 | Stub | strong |
| Richard Lashof | S1,S5,S8,S9 | Start | strong |
| Richard Laver | S1,S8,S9 | Start | strong |
| Richard Leibler | S1,S8,S9 | Stub | strong |
| Richard Lyons (mathematician) | S1,S8,S9 | Stub | strong |
| Richard M. Dudley | S2,S8,S9 | Stub | strong |
| Richard M. Karp | S1,S3,S8,S9 | C | strong |
| Richard M. Pollack | S1,S8,S9 | Start | strong |
| Richard Maunder | S1 | Start | strong |
| Richard Meyer (mathematician) | S1,S8 | Stub | strong |
| Richard Milton Martin | S2,S9 | Start | strong |
| Richard Montague | S2,S5,S8,S9 | Stub | strong |
| Richard Montgomery (mathematician) | S1,S8,S9 | Start | strong |
| Richard Neapolitan | S1 | C | strong |
| Richard Nickl | S1,S8,S9 | Start | strong |
| Richard Norwood | S1,S9 | Start | strong |
| Richard P. Stanley | S1,S6,S8,S9 | Stub | strong |
| Richard Palais | S1,S5,S8,S9 | C | strong |
| Richard Pendlebury | S1 | Stub | strong |
| Richard Proto | S2 | Start | strong |
| Richard Rado | S1,S8,S9 | C | strong |
| Richard Rufus of Cornwall | S2 | Stub | strong |
| Richard Rusczyk | S1,S6,S9 | C | strong |
| Richard S. Ellis | S1,S9 | Stub | strong |
| Richard S. Hamilton | S1,S8,S9 | C | strong |
| Richard S. Pierce | S1,S9 | Start | strong |
| Richard S. Varga | S1,S8,S9 | Stub | strong |
| Richard S. Ward | S1 | Start | strong |
| Richard Samworth | S2,S8,S9 | Start | strong |
| Richard Schelp | S1,S8,S9 | Stub | strong |
| Richard Schroeppel | S1,S6,S8,S9 | Stub | strong |
| Richard Schwartz (mathematician) | S1,S6,S8,S9 | Start | strong |
| Richard Shore | S1,S8,S9 | Stub | strong |
| Richard Shute | S2 | Stub | strong |
| Richard Skemp | S1 | Start | strong |
| Richard Swan | S1,S5,S8,S9 | Stub | strong |
| Richard Swineshead | S1,S6,S9 | Stub | strong |
| Richard Sylvan | S2 | Start | strong |
| Richard Taylor (mathematician) | S1,S5,S6,S8,S9 | Start | strong |
| Richard Teng | S2 | Start | strong |
| Richard Thomas (mathematician) | S1,S8,S9 | Start | strong |
| Richard Townsend (mathematician) | S1 | Stub | strong |
| Richard V. Andree | S1 | Stub | strong |
| Richard V. Southwell | S1 | Start | strong |
| Richard von Mises | S1,S3,S5,S6,S8,S9 | C | strong |
| Richard von Mises Prize | S1,S9 | Stub | strong |
| Richard W. Cottle | S1,S9 | Start | strong |
| Richard Wagner | S4 | | strong |
| Richard Weber (mathematician) | S1,S8,S9 | Start | strong |
| Richard Whately | S2,S9 | Start | strong |
| Richard White (mathematician) | S1 | Stub | strong |
| Richard's paradox | S1,S5,S6,S8,S9 | Start | strong |
| Richards equation | S3,S4,S5,S6,S8,S9 | Start | strong |
| Richards' theorem | S1,S5,S6 | C | strong |
| Richardson extrapolation | S1,S4,S5,S6,S8 | C | strong |
| Richardson number | S3,S4,S5,S9 | Start | strong |
| Richardson Professor of Applied Mathematics | S1,S6,S9 | Stub | strong |
| Richardson's theorem | S1,S5,S6,S8,S9 | Start | strong |
| Richardson–Lucy deconvolution | S1,S2 | Start | strong |
| Richmond surface | S1,S8 | Stub | strong |
| Richter scale | S4,S8 | | strong |
| Richtmyer–Meshkov instability | S3,S4 | Stub | strong |
| Rick Durrett | S1,S8,S9 | Stub | strong |
| Rick Jardine | S1,S5,S9 | Start | strong |
| Rickart space | S1,S6 | Stub | strong |
| Ricker model | S4,S5 | | strong |
| Ricker wavelet | S1,S4,S5,S8 | Start | strong |
| Ricky McCormick's encrypted notes | S2 | B | strong |
| Ricochet (software) | S2 | Start | strong |
| Ridders' method | S1,S5,S6,S8,S9 | Start | strong |
| Ridge (differential geometry) | S1,S9 | Stub | strong |
| Ridge function | S6 | | S6 near |
| Ridge regression | S1,S2,S4,S5,S6,S8,S9 | Start | strong |
| Ridgeline plot | S2 | Stub | strong |
| Ridit scoring | S2,S6 | Start | strong |
| Riemann curvature tensor | S1,S3,S4,S5,S6,S8,S9 | C | strong |
| Riemann form | S1,S6,S8 | Stub | strong |
| Riemann hypothesis | S1,S4,S5,S6,S8,S9 | B | strong |
| Riemann integral | S1,S4,S5,S6,S8,S9 | B | strong |
| Riemann invariant | S1,S4,S6,S8,S9 | Start | strong |
| Riemann mapping theorem | S1,S4,S5,S6,S8,S9 | Start | strong |
| Riemann problem | S1,S4,S5,S6,S8,S9 | Start | strong |
| Riemann series theorem | S1,S4,S5,S6,S8,S9 | B | strong |
| Riemann solver | S3,S4,S6,S8,S9 | Start | strong |
| Riemann sphere | S1,S4,S5,S8,S9 | B | strong |
| Riemann sum | S1,S4,S5,S6,S8,S9 | C | strong |
| Riemann surface | S1,S4,S5,S8 | B | strong |
| Riemann xi function | S1,S5,S6,S8,S9 | Start | strong |
| Riemann zeta function | S1,S4,S5,S6,S8,S9 | B | strong |
| Riemann's differential equation | S1,S5,S6,S8,S9 | Start | strong |
| Riemann's existence theorem | S1,S8,S9 | Start | strong |
| Riemann's minimal surface | S1,S6,S8,S9 | Start | strong |
| Riemannian connection on a surface | S1,S6,S8,S9 | C | strong |
| Riemannian geometry | S1,S5,S8,S9 | Start | strong |
| Riemannian manifold | S1,S4,S5,S6,S8,S9 | C | strong |
| Riemannian metric and Lie bracket in computational anatomy | S6 | | S6 near |
| Riemannian Penrose inequality | S1,S3,S4,S5,S6,S8,S9 | Start | strong |
| Riemannian submanifold | S1,S8,S9 | Stub | strong |
| Riemannian submersion | S1,S6,S8,S9 | Stub | strong |
| Riemann–Hilbert correspondence | S1,S4,S6,S8,S9 | Start | strong |
| Riemann–Hilbert problem | S1,S4,S5,S6,S8,S9 | Start | strong |
| Riemann–Hurwitz formula | S1,S4,S5,S6,S8,S9 | C | strong |
| Riemann–Lebesgue lemma | S1,S4,S5,S6,S8,S9 | B | strong |
| Riemann–Liouville integral | S1,S4,S5,S6,S8,S9 | Start | strong |
| Riemann–Roch theorem | S1,S4,S5,S6,S8,S9 | C | strong |
| Riemann–Roch theorem for smooth manifolds | S1,S5,S6,S8,S9 | Stub | strong |
| Riemann–Roch theorem for surfaces | S1,S5,S6,S8,S9 | Start | strong |
| Riemann–Roch-type theorem | S1,S6,S9 | Start | strong |
| Riemann–Siegel formula | S1,S5,S6,S8,S9 | Start | strong |
| Riemann–Siegel theta function | S1,S5,S6,S8,S9 | Start | strong |
| Riemann–Silberstein vector | S1,S3,S4,S6,S8,S9 | Start | strong |
| Riemann–Stieltjes integral | S1,S4,S5,S6,S8,S9 | C | strong |
| Riemann–von Mangoldt formula | S1,S5,S6,S8,S9 | Stub | strong |
| Rien Kaashoek | S1,S9 | Start | strong |
| Riesel number | S1,S5,S6,S8,S9 | Start | strong |
| Riesz | S4 | | strong |
| Riesz function | S1,S5,S6,S8,S9 | Start | strong |
| Riesz mean | S1,S4,S5,S6,S9 | Start | strong |
| Riesz potential | S1,S4,S5,S6,S9 | Stub | strong |
| Riesz projector | S4,S6 | | strong |
| Riesz rearrangement inequality | S1,S5,S6,S8,S9 | Start | strong |
| Riesz representation theorem | S1,S4,S5,S6,S8,S9 | B | strong |
| Riesz sequence | S4,S6,S9 | | strong |
| Riesz space | S1,S4,S6,S8,S9 | Stub | strong |
| Riesz transform | S1,S4,S5,S6,S9 | Start | strong |
| Riesz's lemma | S1,S4,S5,S6,S8,S9 | C | strong |
| Riesz–Fischer theorem | S1,S4,S5,S6,S8,S9 | B | strong |
| Riesz–Markov–Kakutani representation theorem | S1,S4,S5,S6,S9 | Start | strong |
| Riesz–Thorin theorem | S1,S4,S5,S6,S8,S9 | C | strong |
| Riffle (anonymity network) | S2 | Start | strong |
| Riffle shuffle permutation | S1,S6 | Start | strong |
| Rifkat Bogdanov | S1 | Stub | strong |
| Rig category | S1,S5,S6,S8 | Start | strong |
| Rigged Hilbert space | S1,S4,S5,S6,S8,S9 | Start | strong |
| Right angle | S1,S5,S6,S8 | C | strong |
| Right ascension | S4,S6 | | strong |
| Right circular cylinder | S1,S5,S6,S9 | C | strong |
| Right conoid | S1,S5,S6,S8,S9 | Stub | strong |
| Right group | S1,S6 | Stub | strong |
| Right half-plane | S1,S6,S9 | Stub | strong |
| Right kite | S1,S5,S8 | Start | strong |
| Right triangle | S1,S5,S6,S8 | C | strong |
| Rigid analytic space | S1,S4,S6,S9 | Start | strong |
| Rigid body | S3,S4,S6,S8,S9 | Start | strong |
| Rigid body dynamics | S3,S4,S5,S6,S8,S9 | B | strong |
| Rigid category | S1,S4,S5,S6,S8,S9 | Start | strong |
| Rigid cohomology | S1,S5,S6,S9 | Stub | strong |
| Rigid origami | S1,S6 | Start | strong |
| Rigid transformation | S1,S5,S6,S9 | Start | strong |
| Rigidity (K-theory) | S1,S4 | Stub | strong |
| Rigidity (mathematics) | S1,S6,S9 | Start | strong |
| Rigidity matroid | S1,S6,S9 | B | strong |
| Rigorous coupled-wave analysis | S3,S4,S6,S8 | Start | strong |
| Rigour | S2,S5,S6,S8,S9 | Start | strong |
| Rijndael MixColumns | S1,S2,S5,S6 | Start | strong |
| Rijndael S-box | S2,S6 | Start | strong |
| Rikitaro Fujisawa | S1,S8 | Start | strong |
| Riley slice | S1 | Stub | strong |
| Rimhak Ree | S1,S9 | C | strong |
| Rina Zazkis | S1 | Stub | strong |
| Rinad Yulmukhametov | S1 | Stub | strong |
| Rinat Kedem | S1,S8 | Start | strong |
| Rind et al. controversy | S2 | B | strong |
| Rindler coordinates | S3,S4,S5,S6,S8 | Start | strong |
| Ring (mathematics) | S1,S4,S5,S6,S8,S9 | B | strong |
| Ring class field | S1,S6 | Stub | strong |
| Ring homomorphism | S1,S4,S5,S6,S8,S9 | C | strong |
| Ring learning with errors | S1,S3,S5,S6,S9 | C | strong |
| Ring learning with errors key exchange | S2,S6,S9 | C | strong |
| Ring learning with errors signature | S2,S9 | C | strong |
| Ring lemma | S1,S6,S8,S9 | C | strong |
| Ring of integers | S1,S4,S5,S6,S8,S9 | Start | strong |
| Ring of mixed characteristic | S1,S6,S9 | Stub | strong |
| Ring of modular forms | S1,S6,S9 | C | strong |
| Ring of polynomial functions | S1,S6,S8,S9 | Start | strong |
| Ring of sets | S1,S4,S6,S8 | Start | strong |
| Ring of symmetric functions | S1,S4,S6,S9 | B | strong |
| Ring signature | S2,S5,S6 | Start | strong |
| Ring spectrum | S1,S4,S5,S6,S8,S9 | Stub | strong |
| Ring theory | S1,S5,S6,S8,S9 | B | strong |
| Ring vaccination | S2 | Start | strong |
| Ringed space | S1,S4,S5,S6,S8 | Start | strong |
| Ringed topos | S1,S5,S6 | Start | strong |
| Ringel–Hall algebra | S1,S5,S6,S8 | Stub | strong |
| Ringing (signal) | S1,S3,S6 | Start | strong |
| Ringschluss | S1,S5,S6,S9 | Start | strong |
| Riordan array | S1,S6,S9 | Start | strong |
| Rip van Winkle cipher | S2,S6 | Stub | strong |
| RIPEMD | S2,S5,S8,S9 | C | strong |
| Rippling | S3,S6 | Start | S6 near |
| Rips machine | S1,S6,S9 | Start | strong |
| Risch algorithm | S1,S4,S5,S6,S8,S9 | C | strong |
| Rise time | S6,S9 | | S6 near |
| Rising moving average | S2,S6 | Stub | strong |
| Rising sun lemma | S1,S5,S6,S8,S9 | Stub | strong |
| Risk adjusted mortality rate | S2 | Stub | strong |
| Risk aversion | S4,S6 | | strong |
| Risk aversion (psychology) | S6 | | S6 near |
| Risk communication | S2 | Start | strong |
| Risk difference | S1,S2,S9 | Start | strong |
| Risk factor | S2,S9 | Start | strong |
| Risk inclination formula | S1,S2,S6 | Stub | strong |
| Risk inclination model | S2,S6 | Start | strong |
| Risk measure | S1,S6 | Start | strong |
| Risk perception | S2,S6 | C | strong |
| Risk score | S2,S6 | Start | strong |
| Risk-limiting audit | S2,S6 | C | strong |
| Risk-neutral measure | S4,S5 | | strong |
| Rita Zemach | S2,S8 | Start | strong |
| Ritabrata Munshi | S1,S8,S9 | Start | strong |
| Riverbank Laboratories | S2 | Start | strong |
| Rizza manifold | S1,S5,S6,S8,S9 | C | strong |
| RL (complexity) | S1,S5,S8 | Start | strong |
| RLC circuit | S4,S9 | | strong |
| Rng (algebra) | S1,S4,S5,S6,S8,S9 | Start | strong |
| Road coloring theorem | S1,S5,S6,S8,S9 | Start | strong |
| Rob Grootendorst | S2 | Stub | strong |
| Rob Reitzen | S1 | Start | strong |
| Rob Schneiderman (mathematician) | S1 | Start | strong |
| Robbins algebra | S1,S4,S5,S6,S9 | Start | strong |
| Robbins lemma | S2,S5,S6,S8,S9 | Stub | strong |
| Robbins pentagon | S1,S6,S8,S9 | Start | strong |
| Robbins' problem | S1,S5,S6,S8 | C | strong |
| Robbins' theorem | S1,S5,S6,S8,S9 | C | strong |
| Robert A. Bosch | S1,S6,S9 | Start | strong |
| Robert Abelson | S2,S8 | Start | strong |
| Robert Adamson (philosopher) | S2 | C | strong |
| Robert Adrain | S1,S9 | Start | strong |
| Robert Alexander Rankin | S1,S9 | Stub | strong |
| Robert Alyngton | S2 | Stub | strong |
| Robert Ammann | S1,S8,S9 | Start | strong |
| Robert Anderson (mathematician) | S1 | Stub | strong |
| Robert Arnott Wilson | S1,S8,S9 | Stub | strong |
| Robert B. Davis | S1 | Stub | strong |
| Robert Baldwin Hayward | S1,S9 | Start | strong |
| Robert Berger (mathematician) | S1,S9 | Start | strong |
| Robert Bixby | S1,S9 | Stub | strong |
| Robert Blanché | S2 | Stub | strong |
| Robert Brandom | S2,S5,S9 | Start | strong |
| Robert Breusch | S1,S9 | Stub | strong |
| Robert Brown Gardner | S1,S9 | Start | strong |
| Robert Bryant (mathematician) | S1,S8,S9 | C | strong |
| Robert C. Elston | S2,S8 | Stub | strong |
| Robert C. Gunning | S1,S8,S9 | Stub | strong |
| Robert C. James | S1,S8,S9 | Start | strong |
| Robert C. Prim | S1,S3,S8,S9 | Start | strong |
| Robert Cahaly | S2 | C | strong |
| Robert Calderbank | S1,S8,S9 | Stub | strong |
| Robert Coveyou | S1,S3 | Start | strong |
| Robert Creighton Buck | S1,S8,S9 | Start | strong |
| Robert D. Gibbons | S2,S8 | Start | strong |
| Robert D. Hough | S1 | Stub | strong |
| Robert D. Russell | S1 | Start | strong |
| Robert Daniel Carmichael | S1,S8,S9 | Stub | strong |
| Robert Daverman | S1,S9 | Stub | strong |
| Robert de Montessus de Ballore | S1,S8 | Stub | strong |
| Robert E. Chaddock | S2,S8,S9 | Start | strong |
| Robert E. Johnson (scientist) | S1 | Stub | strong |
| Robert E. Valett | S2 | Start | strong |
| Robert Edgar Allardice | S1,S9 | Stub | strong |
| Robert Edmund O'Malley | S1 | Start | strong |
| Robert Edouard Moritz | S1,S8 | Stub | strong |
| Robert Ellis (mathematician) | S1 | Stub | strong |
| Robert Everist Greene | S1,S8,S9 | Start | strong |
| Robert Evert Stong | S1,S5,S8,S9 | Start | strong |
| Robert F. Boruch | S2,S6,S8 | Stub | strong |
| Robert F. Coleman | S1,S8,S9 | Start | strong |
| Robert F. Tichy | S1,S8,S9 | Start | strong |
| Robert Fernholz | S1 | Start | strong |
| Robert Feys | S2,S9 | Stub | strong |
| Robert Finn (mathematician) | S1,S9 | Stub | strong |
| Robert Forsyth Scott | S1,S9 | Stub | strong |
| Robert Fortet | S1,S8,S9 | Stub | strong |
| Robert Franklin Muirhead | S1,S8,S9 | Start | strong |
| Robert Fricke | S1,S8,S9 | Stub | strong |
| Robert Frucht | S1,S8,S9 | Start | strong |
| Robert G. Bartle | S1,S9 | Stub | strong |
| Robert G. Bland | S1,S8,S9 | Stub | strong |
| Robert Ghrist | S1,S5,S8,S9 | Start | strong |
| Robert Giffen | S1,S2,S8,S9 | Start | strong |
| Robert Goldblatt | S1,S5,S9 | Stub | strong |
| Robert Gompf | S1,S8,S9 | Stub | strong |
| Robert Goodell Brown | S1 | Stub | strong |
| Robert Gordon of Straloch | S1 | Start | strong |
| Robert Griess | S1,S5,S8,S9 | C | strong |
| Robert Grosseteste | S2,S9 | C | strong |
| Robert Grosseteste: The Growth of an English Mind in Medieval Europe | S2 | Start | strong |
| Robert Groves | S2,S8 | Start | strong |
| Robert Guralnick | S1,S8,S9 | Stub | strong |
| Robert H. Shumway | S2,S8,S9 | Start | strong |
| Robert Haldane (mathematician) | S1 | Start | strong |
| Robert Harley (mathematician) | S1 | Start | strong |
| Robert Heath (mathematician) | S1 | Start | strong |
| Robert Henry Risch | S1,S8,S9 | Stub | strong |
| Robert Horton Cameron | S1,S8,S9 | Stub | strong |
| Robert Hues | S1,S9 | FA | strong |
| Robert I. Jewett | S1 | Stub | strong |
| Robert I. Soare | S1,S8,S9 | Stub | strong |
| Robert J. Elliott | S1,S8,S9 | Start | strong |
| Robert J. Plemmons | S1,S9 | C | strong |
| Robert J. T. Bell | S1 | Start | strong |
| Robert J. Vanderbei | S1,S8,S9 | C | strong |
| Robert James Blattner | S1 | Stub | strong |
| Robert John Audley | S2,S6 | Start | strong |
| Robert Joshua Rubin | S1 | Stub | strong |
| Robert Judson Aley | S1 | Stub | strong |
| Robert Kass | S2,S8,S9 | Start | strong |
| Robert Kilwardby | S2 | C | strong |
| Robert Kowalski | S2 | Start | strong |
| Robert Kozma (professor) | S1 | Start | strong |
| Robert König | S1,S9 | Stub | strong |
| Robert L. Causey | S2 | Stub | strong |
| Robert L. Devaney | S1,S9 | C | strong |
| Robert Langlands | S1,S5,S8,S9 | C | strong |
| Robert Lawson Vaught | S2,S8,S9 | Start | strong |
| Robert Lazarsfeld | S1,S8,S9 | Stub | strong |
| Robert Lee Moore | S1,S8,S9 | Start | strong |
| Robert Leslie Ellis | S2,S9 | Start | strong |
| Robert Liptser | S1 | Start | strong |
| Robert Lowth | S2 | | strong |
| Robert M. Anderson (mathematician) | S1,S9 | Start | strong |
| Robert M. Solovay | S1,S2,S8,S9 | Start | strong |
| Robert Mackenzie Johnston | S1,S8 | Start | strong |
| Robert MacPherson (mathematician) | S1,S5,S8,S9 | Start | strong |
| Robert McCallum Blumenthal | S1,S9 | Stub | strong |
| Robert McCann (mathematician) | S1,S8,S9 | Start | strong |
| Robert McLachlan (mathematician) | S1 | Start | strong |
| Robert McNair Ferguson | S1 | Start | strong |
| Robert McNaughton | S1 | Stub | strong |
| Robert Megginson | S1,S9 | Start | strong |
| Robert Miller Hardt | S1,S8 | Start | strong |
| Robert Minlos | S1,S4,S8,S9 | Stub | strong |
| Robert Moody | S1,S9 | Start | strong |
| Robert Morris (cryptographer) | S2 | Stub | strong |
| Robert Murphy (mathematician) | S1 | Start | strong |
| Robert Osserman | S1,S8,S9 | Start | strong |
| Robert P. Dilworth | S1,S8,S9 | Start | strong |
| Robert P. Lipton | S1 | Start | strong |
| Robert Penner | S1,S5,S6,S9 | Start | strong |
| Robert Percival Porter | S2 | C | strong |
| Robert Phelps | S1,S8,S9 | C | strong |
| Robert Pollock Gillespie | S1,S9 | Start | strong |
| Robert R. Jensen | S1,S8 | Stub | strong |
| Robert R. Sokal | S2,S8,S9 | Start | strong |
| Robert Recorde | S1,S8,S9 | Start | strong |
| Robert Remak (mathematician) | S1,S8,S9 | Start | strong |
| Robert Richard Anstice | S1,S9 | Start | strong |
| Robert Riley (mathematician) | S1,S9 | Start | strong |
| Robert Rosebrugh | S1 | Stub | strong |
| Robert Rumely | S1,S8,S9 | Start | strong |
| Robert Russell (Irish mathematician) | S1 | Stub | strong |
| Robert S. Boyer | S1,S2,S8,S9 | Stub | strong |
| Robert S. Doran | S1,S9 | B | strong |
| Robert S. Hartman | S2,S3 | Start | strong |
| Robert Santos | S2,S8,S9 | Start | strong |
| Robert Sauer (mathematician) | S1,S9 | Start | strong |
| Robert Schatten | S1,S8,S9 | Start | strong |
| Robert Simson | S1,S8,S9 | Start | strong |
| Robert Sinclair MacKay | S1,S9 | Stub | strong |
| Robert Smith (mathematician) | S1,S9 | Start | strong |
| Robert Sorgenfrey | S1,S5,S9 | Stub | strong |
| Robert Stalnaker | S2 | C | strong |
| Robert Stanton Avery | S1 | Stub | strong |
| Robert Thomas Seeley | S1,S8,S9 | Stub | strong |
| Robert Tibshirani | S2,S8,S9 | C | strong |
| Robert Tijdeman | S1,S8,S9 | Stub | strong |
| Robert Tucker (mathematician) | S1 | Start | strong |
| Robert V. Hogg | S1,S2,S8,S9 | C | strong |