| Article | Signals | Class | Rule |
| I = PAT | S5,S6 | | S6 near |
| I know that I know nothing | S2,S5 | C | strong |
| I'm entitled to my opinion | S2 | Start | strong |
| I-adic topology | S1,S4,S6,S8,S9 | Start | strong |
| I-bundle | S1,S6,S8,S9 | Stub | strong |
| I-spline | S1,S8,S9 | Stub | strong |
| I. Elaine Allen | S2,S8 | Start | strong |
| I. J. Good | S1,S2,S3,S8,S9 | C | strong |
| I. Martin Isaacs | S1,S8,S9 | Start | strong |
| I. Michael Ross | S1,S3,S9 | C | strong |
| I. Richard Savage | S2,S8,S9 | Start | strong |
| I2P | S2 | B | strong |
| IA automorphism | S1,S6 | Stub | strong |
| Iacopo Barsotti | S1,S8,S9 | Stub | strong |
| Iain Gordon | S1,S8,S9 | Start | strong |
| Ian Agol | S1,S5,S8,S9 | Start | strong |
| Ian F. Putnam | S1 | Start | strong |
| Ian Ford (statistician) | S1 | Start | strong |
| Ian G. Macdonald | S1,S6,S8,S9 | Start | strong |
| Ian Goldberg | S2 | Start | strong |
| Ian Goulden | S1,S8,S9 | Start | strong |
| Ian Grojnowski | S1,S5,S8,S9 | Stub | strong |
| Ian R. Porteous | S1,S9 | B | strong |
| Ian Rumfitt | S2 | Stub | strong |
| Ian Sloan (mathematician) | S1,S8,S9 | B | strong |
| Ian Sneddon | S1,S9 | Start | strong |
| Ian Stewart (mathematician) | S1,S5,S6,S8,S9 | Start | strong |
| IAPM (mode) | S2 | Start | strong |
| Iatromathematicians | S6 | | S6 near |
| Ib Madsen | S1,S5,S8,S9 | Start | strong |
| Ibn Adlan | S2,S8,S9 | C | strong |
| Ibn al-Durayhim | S2,S9 | Stub | strong |
| Ibn al-Haytham | S1,S4,S5,S6,S8,S9 | B | strong |
| Ibn Hamza al-Maghribi | S1,S9 | Stub | strong |
| Ibn Mu'adh al-Jayyani | S1,S9 | Stub | strong |
| Ibn Yunus | S1,S9 | Start | strong |
| Ibragimov–Iosifescu conjecture for φ-mixing sequences | S1,S6,S8 | Start | strong |
| Ibrahim Eltayeb | S1 | Start | strong |
| Ibrahim ibn Sinan | S1,S9 | Start | strong |
| ICD-10-CM | S2 | Start | strong |
| ICE (cipher) | S2 | C | strong |
| Ice-sheet model | S4 | | strong |
| Ice-type model | S1,S4,S5,S6,S9 | Start | strong |
| Icelandic Junior College Mathematics Competition | S1 | Start | strong |
| Icelandic Mathematical Society | S1,S8,S9 | B | strong |
| Ice–albedo feedback | S4,S8 | | strong |
| ICH E9(R1) addendum on estimands and sensitivity analyses in clinical trials | S2 | | strong |
| Ichirō Satake | S1,S5,S9 | Start | strong |
| Iconography of correlations | S2,S3,S9 | Start | strong |
| Icons of Mathematics | S1,S6,S9 | Start | strong |
| Icosagon | S1,S5,S8 | Start | strong |
| Icosahedral 120-cell | S1,S5,S8,S9 | Stub | strong |
| Icosahedral bipyramid | S1,S9 | Stub | strong |
| Icosahedral honeycomb | S1,S6,S8 | Stub | strong |
| Icosahedral number | S1,S5,S6,S9 | Stub | strong |
| Icosahedral pyramid | S1,S5,S9 | Stub | strong |
| Icosahedral symmetry | S1,S5,S6,S8,S9 | Start | strong |
| Icosahedron | S1,S5,S6,S8,S9 | Start | strong |
| Icosian | S1,S5,S6,S9 | Stub | strong |
| Icosian calculus | S1,S6,S9 | Start | strong |
| Icosian game | S1,S5,S6,S8,S9 | GA | strong |
| Icosidodecadodecahedron | S1,S5,S8,S9 | Stub | strong |
| Icosidodecahedron | S1,S5,S8,S9 | C | strong |
| Icositetragon | S1,S5,S8 | Start | strong |
| Icositetrahedron | S1,S5,S8,S9 | C | strong |
| Icositrigon | S1,S8 | C | strong |
| Icositruncated dodecadodecahedron | S1,S5,S8,S9 | Stub | strong |
| ICTP Ramanujan Prize | S1,S8,S9 | List | strong |
| Ida Busbridge | S1,S9 | C | strong |
| Ida Craven Merriam | S2,S8 | Start | strong |
| Ida Martha Metcalf | S1 | Start | strong |
| Ida May Schottenfels | S1 | Start | strong |
| Ida surface | S1,S6,S9 | B | strong |
| IDEA NXT | S2,S5 | Stub | strong |
| Ideal (order theory) | S1,S4,S5,S6,S8,S9 | Start | strong |
| Ideal (ring theory) | S1,S4,S5,S6,S8,S9 | C | strong |
| Ideal chain | S4,S5 | | strong |
| Ideal class group | S1,S4,S5,S6,S8,S9 | Start | strong |
| Ideal gas | S3,S4,S6 | C | strong |
| Ideal gas law | S3,S4,S5,S6,S9 | C | strong |
| Ideal lattice | S2,S6 | Start | strong |
| Ideal norm | S1,S4,S6,S9 | Start | strong |
| Ideal number | S1,S5,S6,S9 | Start | strong |
| Ideal on a set | S1,S6,S9 | Start | strong |
| Ideal point | S1,S5,S6,S8,S9 | Start | strong |
| Ideal polyhedron | S1,S8,S9 | GA | strong |
| Ideal quotient | S1,S4,S5,S6,S8,S9 | Stub | strong |
| Ideal sheaf | S1,S4,S6,S8 | Start | strong |
| Ideal theory | S1,S5,S6,S8,S9 | Start | strong |
| Ideal triangle | S1,S8,S9 | C | strong |
| Idealised population | S2,S6 | C | strong |
| Idealizer | S1,S5,S6,S9 | Stub | strong |
| Idele group | S1,S6,S8,S9 | C | strong |
| Idempotence | S1,S4,S5,S6,S8,S9 | C | strong |
| Idempotent (ring theory) | S1,S4,S5,S6,S8,S9 | C | strong |
| Idempotent analysis | S1,S5,S6,S8,S9 | Stub | strong |
| Idempotent matrix | S1,S2,S4,S5,S6,S9 | Start | strong |
| Idempotent measure | S1,S5,S6 | Stub | strong |
| Idempotent relation | S1,S8 | Start | strong |
| Identifiability | S2,S4 | Start | strong |
| Identifiability analysis | S2,S6 | Start | strong |
| Identity (mathematics) | S1,S4,S5,S6,S8,S9 | C | strong |
| Identity (philosophy) | S2,S8,S9 | Start | strong |
| Identity channel | S6 | | S6 near |
| Identity component | S1,S4,S5,S6,S9 | C | strong |
| Identity element | S1,S4,S5,S6,S8,S9 | Start | strong |
| Identity function | S1,S4,S5,S6,S8,S9 | C | strong |
| Identity line | S1,S6 | Stub | strong |
| Identity matrix | S1,S4,S5,S6,S8,S9 | Start | strong |
| Identity of indiscernibles | S2,S5,S8,S9 | Start | strong |
| Identity theorem | S1,S4,S5,S6,S8,S9 | Start | strong |
| Identity theorem for Riemann surfaces | S1,S5,S6,S8,S9 | Stub | strong |
| Identity type | S1,S3,S6 | Start | strong |
| Identity-based conditional proxy re-encryption | S2,S3,S6 | C | strong |
| Identity-based cryptography | S2,S6 | Start | strong |
| Identity-based encryption | S2,S6 | C | strong |
| Identric mean | S1,S2,S5,S6 | Stub | strong |
| Ideographic approach | S2,S6 | Stub | strong |
| Ideological bias on Wikipedia | S2 | C | strong |
| Ideonomy | S6 | | S6 near |
| Idola fori | S2 | Start | strong |
| Idola specus | S2 | Stub | strong |
| Idola theatri | S2 | Start | strong |
| Idola tribus | S2 | Stub | strong |
| Idoneal number | S1,S5,S6,S8,S9 | Start | strong |
| Idris Assani | S1,S8,S9 | Start | strong |
| IEEE 754 | S3,S4,S6 | C | strong |
| IEEE 802.11i-2004 | S2,S6 | C | strong |
| IEEE P1363 | S2,S6 | Start | strong |
| Ieke Moerdijk | S1,S5,S8,S9 | Start | strong |
| Ietje Paalman-de Miranda | S1 | Start | strong |
| If and only if | S1,S2,S5,S6,S8,S9 | Start | strong |
| Ignacas Stasys Uždavinys | S1 | Stub | strong |
| Ignace-Louis-Alfred Le Cointe | S1 | C | strong |
| Ignacy Zaborowski | S1,S8 | Start | strong |
| Ignatov's theorem | S1,S5,S6 | Stub | strong |
| Ignorability | S1,S2 | Start | strong |
| Ignoramus et ignorabimus | S2 | Start | strong |
| Ignotum per ignotius | S2 | Stub | strong |
| Igor Chueshov | S1 | C | strong |
| Igor Dmitrievich Ado | S1 | Start | strong |
| Igor Dolgachev | S1,S5,S8,S9 | Stub | strong |
| Igor Frenkel | S1,S5,S8,S9 | Stub | strong |
| Igor Girsanov | S1 | Start | strong |
| Igor Kluvánek | S1 | Start | strong |
| Igor Krichever | S1,S8,S9 | Start | strong |
| Igor Lomov | S1 | Stub | strong |
| Igor Prünster | S1,S8,S9 | Stub | strong |
| Igor Rodnianski | S1,S8,S9 | Start | strong |
| Igor Shafarevich | S1,S5,S8,S9 | C | strong |
| Igor Shelushkov | S1,S6 | Stub | strong |
| Igor Simonenko | S1 | Start | strong |
| Igusa group | S1 | Stub | strong |
| Igusa quartic | S1,S9 | Stub | strong |
| Igusa variety | S1,S6 | Stub | strong |
| Igusa zeta function | S1,S6,S8 | Start | strong |
| Ihara zeta function | S1,S5,S6,S8,S9 | Start | strong |
| Ihara's lemma | S1,S5,S6 | Stub | strong |
| II25,1 | S1,S6,S9 | Start | strong |
| Iitaka dimension | S1,S5,S6,S8,S9 | C | strong |
| IJP The Book of Surfaces | S1 | Start | strong |
| Ikeda lift | S1,S6 | Stub | strong |
| Ikeda map | S3,S5,S6,S8,S9 | Start | S6 near |
| Ilan Amit | S1 | Start | strong |
| Ilaria Perugia | S1 | Start | strong |
| Ildar Ibragimov (mathematician) | S1,S8,S9 | Stub | strong |
| Ilie Popa (mathematician) | S1 | Start | strong |
| Ilijas Farah | S1,S8,S9 | Start | strong |
| Ilka Agricola | S1,S5,S8,S9 | Start | strong |
| Illegal number | S1,S2,S6,S8,S9 | C | strong |
| Illicit major | S2,S9 | Stub | strong |
| Illicit minor | S2,S9 | Stub | strong |
| Illinois Journal of Mathematics | S1,S8,S9 | Stub | strong |
| Illumination problem | S1,S4,S5,S6,S9 | Start | strong |
| Illuminationism | S2,S6,S8,S9 | C | strong |
| Illustration of the central limit theorem | S1,S2,S6,S8,S9 | Start | strong |
| Ilona Palásti | S1,S8,S9 | Start | strong |
| Ilse Fischer | S1,S6 | Start | strong |
| Ilse Ipsen | S1,S8,S9 | Start | strong |
| Ilya Kapovich | S1,S9 | Start | strong |
| Ilya M. Sobol' | S1 | C | strong |
| Ilya Nikolaevich Bronshtein | S1,S8,S9 | Start | strong |
| Ilya Piatetski-Shapiro | S1,S8,S9 | B | strong |
| IM 67118 | S1,S9 | C | strong |
| Im schwarzen Walfisch zu Askalon | S6 | | S6 near |
| IMA Journal of Applied Mathematics | S1 | Stub | strong |
| IMA Journal of Management Mathematics | S1,S8 | Stub | strong |
| IMA Journal of Numerical Analysis | S1,S9 | Start | strong |
| Image | S1,S3 | C | strong |
| Image (category theory) | S1,S6,S8,S9 | Start | strong |
| Image (mathematics) | S1,S4,S5,S6,S8,S9 | C | strong |
| Image functors for sheaves | S1,S6 | B | strong |
| Image plane | S6,S9 | | S6 near |
| Imaginary (exhibition) | S1 | Start | strong |
| Imaginary curve | S1 | Stub | strong |
| Imaginary element | S1,S6,S8 | Start | strong |
| Imaginary hyperelliptic curve | S1,S9 | C | strong |
| Imaginary line (mathematics) | S1,S5,S6,S9 | Start | strong |
| Imaginary number | S1,S5,S6,S8,S9 | C | strong |
| Imaginary unit | S1,S4,S5,S6,S8,S9 | C | strong |
| Imaging cycler microscopy | S6 | | S6 near |
| Imbalance conjecture | S5,S6,S8,S9 | | S6 near |
| Immanant | S1,S5,S6,S8,S9 | Stub | strong |
| Immanuel Bomze | S1 | Start | strong |
| Immanuel Halton | S1 | Start | strong |
| Immediate inference | S2,S8 | Start | strong |
| Immerman–Szelepcsényi theorem | S1,S4,S5,S6,S8,S9 | Start | strong |
| Immersed boundary method | S3,S4,S5,S6,S8,S9 | Start | strong |
| Immersion (mathematics) | S1,S4,S5,S6,S8,S9 | B | strong |
| Immigration and crime | S2 | C | strong |
| Immigration statistics in France | S2 | B | strong |
| Immigration to Lawrence, Massachusetts | S2 | Start | strong |
| Impartial culture | S2,S6 | Stub | strong |
| Imperative logic | S2,S6,S8,S9 | Start | strong |
| Imperfect group | S1,S6 | Stub | strong |
| Imperfect induction | S2 | Stub | strong |
| Implementation fidelity | S2 | Stub | strong |
| Implementation of mathematics in set theory | S1,S6,S9 | B | strong |
| Implementation theory | S6 | | S6 near |
| Implicant | S2,S6,S8,S9 | Start | strong |
| Implication graph | S1,S6,S9 | Start | strong |
| Implicational propositional calculus | S1,S5,S6,S8,S9 | Start | strong |
| Implicature | S2 | GA | strong |
| Implicit certificate | S2,S6 | Start | strong |
| Implicit computational complexity | S3,S6 | Stub | S6 near |
| Implicit curve | S1,S5,S6 | C | strong |
| Implicit differentiation | S1,S6,S8,S9 | C | strong |
| Implicit function | S1,S4,S5,S6,S8,S9 | C | strong |
| Implicit function theorem | S1,S4,S5,S6,S8,S9 | C | strong |
| Implicit graph | S3,S6,S8,S9 | B | S6 near |
| Implicit surface | S1,S6,S9 | C | strong |
| Implied volatility | S4,S6,S9 | | strong |
| Importance sampling | S2,S4,S6,S8 | Start | strong |
| Impossible cube | S1,S5 | Start | strong |
| Impossible differential cryptanalysis | S2,S6 | Start | strong |
| Impossible object | S1,S5 | Start | strong |
| Impossible trident | S1,S5 | Start | strong |
| Impossible world | S2,S6,S8 | Start | strong |
| Imprecise Dirichlet process | S2,S8,S9 | C | strong |
| Imprecise probability | S1,S2,S5,S6,S9 | C | strong |
| Impredicativity | S1,S2,S5,S6,S8,S9 | Start | strong |
| Improper integral | S1,S4,S5,S6,S8,S9 | C | strong |
| Improper rotation | S1,S5,S6,S8 | Stub | strong |
| Impulse (physics) | S3,S4,S5,S8 | Start | strong |
| Impulse response | S2,S3,S4,S6,S8,S9 | C | strong |
| Imputation (statistics) | S2,S9 | Start | strong |
| Imre Csiszár | S1,S8,S9 | Start | strong |
| Imre Lakatos | S2,S8,S9 | C | strong |
| Imre Leader | S1,S6,S8,S9 | Stub | strong |
| Imre Simon | S1,S9 | Stub | strong |
| IMSI-catcher | S2 | Start | strong |
| IMU Abacus Medal | S1,S5,S6,S8,S9 | Stub | strong |
| In Pursuit of the Traveling Salesman | S1,S6 | C | strong |
| In silico clinical trials | S2,S6 | Start | strong |
| In-crowd algorithm | S1,S5,S6,S8 | Start | strong |
| Ina Kersten | S1,S8,S9 | Stub | strong |
| Inaccessible cardinal | S1,S4,S5,S6,S8 | B | strong |
| Inca mathematics | S1,S6,S8,S9 | C | strong |
| Ince equation | S1,S5 | Stub | strong |
| Incenter | S1,S4,S5,S8 | C | strong |
| Incenter–excenter lemma | S1,S5 | Start | strong |
| Incentive compatibility | S4,S5,S6 | | strong |
| Incidence (epidemiology) | S2,S9 | Start | strong |
| Incidence (geometry) | S1,S5,S6,S8,S9 | Start | strong |
| Incidence algebra | S1,S4,S5,S6,S8,S9 | Start | strong |
| Incidence and Symmetry in Design and Architecture | S1,S9 | Start | strong |
| Incidence coloring | S1,S5,S6,S8 | C | strong |
| Incidence geometry | S1,S4,S5,S6,S8,S9 | C | strong |
| Incidence matrix | S1,S4,S5,S6,S8,S9 | Start | strong |
| Incidence poset | S1,S6,S9 | Start | strong |
| Incidence structure | S1,S4,S5,S6,S9 | C | strong |
| Incircle and excircles | S1,S4,S5,S8 | B | strong |
| Inclusion (Boolean algebra) | S1,S6 | Stub | strong |
| Inclusion (logic) | S2,S5,S6 | Stub | strong |
| Inclusion map | S1,S5,S6,S8,S9 | Start | strong |
| Inclusion order | S1,S6,S9 | Stub | strong |
| Inclusion–exclusion principle | S1,S4,S5,S6,S8,S9 | C | strong |
| Inclusive composite interval mapping | S2,S6 | C | strong |
| Incompatible-properties argument | S2 | Start | strong |
| Incomplete Bessel functions | S1,S6 | Stub | strong |
| Incomplete Bessel K function/generalized incomplete gamma function | S1,S6 | Stub | strong |
| Incomplete Cholesky factorization | S1,S4,S6,S8,S9 | Stub | strong |
| Incomplete comparison | S2 | Stub | strong |
| Incomplete contracts | S6 | | S6 near |
| Incomplete Fermi–Dirac integral | S1,S6,S8,S9 | Stub | strong |
| Incomplete gamma function | S1,S4,S5,S6,S8,S9 | C | strong |
| Incomplete LU factorization | S4,S5,S6,S8,S9 | | strong |
| Incompressibility method | S1,S6 | Start | strong |
| Incompressible flow | S3,S4,S5,S8 | Start | strong |
| Incompressible surface | S1,S4,S6,S8,S9 | C | strong |
| Inconsistent triad | S2 | Start | strong |
| Increasing process | S1,S2 | Stub | strong |
| Increment theorem | S1,S5,S6,S8,S9 | Stub | strong |
| Incremental validity | S2 | Start | strong |
| Ind-completion | S1,S4,S6,S9 | Start | strong |
| Ind-scheme | S1,S5,S6,S8,S9 | Stub | strong |
| Indecomposability (intuitionistic logic) | S1,S6,S9 | Stub | strong |
| Indecomposable continuum | S1,S4,S5,S6 | Start | strong |
| Indecomposable distribution | S2,S9 | Start | strong |
| Indecomposable module | S1,S4,S5,S6,S8 | Start | strong |
| Indefinite and fictitious numbers | S1,S6,S8,S9 | Start | strong |
| Indefinite inner product space | S1,S4,S5,S6,S8,S9 | Start | strong |
| Indefinite orthogonal group | S1,S4,S8 | Start | strong |
| Indefinite product | S1,S6,S8,S9 | Start | strong |
| Indefinite sum | S1,S2,S3,S4,S6,S8,S9 | C | strong |
| Independence (mathematical logic) | S1,S5,S6,S8,S9 | Start | strong |
| Independence (probability theory) | S1,S2,S4,S5,S8,S9 | C | strong |
| Independence complex | S1,S5,S6,S9 | Start | strong |
| Independence of irrelevant alternatives | S2,S5,S6 | C | strong |
| Independence of premise | S1,S6,S9 | Start | strong |
| Independence system | S1,S6,S9 | Stub | strong |
| Independence Theory in Combinatorics | S1,S6 | C | strong |
| Independence-friendly logic | S1,S2,S6,S8,S9 | Start | strong |
| Independent and identically distributed random variables | S2,S4,S8,S9 | Start | strong |
| Independent component analysis | S2,S4 | C | strong |
| Independent dominating set | S1,S6 | C | strong |
| Independent equation | S1,S6,S9 | Stub | strong |
| Independent increments | S1,S6,S9 | Start | strong |
| Independent set (graph theory) | S1,S3,S4,S5,S6,S8,S9 | C | strong |
| Inder Bir Singh Passi | S1,S9 | Stub | strong |
| Indescribable cardinal | S1,S6,S8 | Start | strong |
| Indeterminate form | S1,S4,S5,S8,S9 | Start | strong |
| Indeterminate system | S1,S6,S9 | Start | strong |
| Index (economics) | S2,S6 | Start | strong |
| Index (statistics) | S2,S6 | Start | strong |
| Index calculus algorithm | S1,S6,S9 | Start | strong |
| Index case | S2 | Start | strong |
| Index ellipsoid | S3,S4 | Start | strong |
| Index group | S1,S6,S8,S9 | Start | strong |
| Index notation | S6,S8,S9 | | S6 near |
| Index of a Lie algebra | S1,S8,S9 | Start | strong |
| Index of a subgroup | S1,S4,S5,S6,S8,S9 | Start | strong |
| Index of accounting articles | S6,S8 | | S6 near |
| Index of biological integrity | S2 | Stub | strong |
| Index of coincidence | S2,S6,S9 | Start | strong |
| Index of combinatorics articles | S6 | | S6 near |
| Index of cryptography articles | S2,S6 | List | strong |
| Index of dispersion | S1,S2,S5,S6,S8,S9 | C | strong |
| Index of dissimilarity | S2,S5,S6 | Stub | strong |
| Index of fractal-related articles | S3,S6,S8 | List | S6 near |
| Index of information theory articles | S6,S8 | | S6 near |
| Index of logarithm articles | S6,S8,S9 | | S6 near |
| Index of wave articles | S3,S6,S8,S9 | List | S6 near |
| Index set | S1,S5,S6,S8,S9 | Start | strong |
| Index set (computability) | S1,S6 | Start | strong |
| Indexation of contracts | S2,S6 | Stub | strong |
| Indexed category | S1,S5,S6 | Stub | strong |
| Indexed family | S1,S5,S6,S8,S9 | C | strong |
| Indexed language | S2,S6 | Start | strong |
| Indexed search | S2,S6,S8 | Stub | strong |
| Indexicality | S2,S8 | C | strong |
| Indian buffet process | S2 | Stub | strong |
| Indian mathematics | S1,S8,S9 | B | strong |
| Indian states ranking by availability of toilets | S2 | List | strong |
| Indian Statistical Institute | S2,S8,S9 | B | strong |
| Indian Statistical Service | S2 | Start | strong |
| Indiana Hoosiers women's basketball statistical leaders | S2 | List | strong |
| Indiana pi bill | S1,S6,S8,S9 | C | strong |
| Indicative conditional | S2,S6,S8,S9 | B | strong |
| Indicator (statistics) | S2 | Stub | strong |
| Indicator function | S1,S4,S5,S6,S8,S9 | C | strong |
| Indicator function (complex analysis) | S1,S5,S6 | Start | strong |
| Indicator function (convex analysis) | S1,S9 | Start | strong |
| Indicator vector | S1,S6,S9 | Stub | strong |
| Indicators of spatial association | S2,S6 | Start | strong |
| Indifference graph | S1,S6,S8,S9 | B | strong |
| Indifference price | S1,S6 | Start | strong |
| Indigenous bundle | S1,S9 | Stub | strong |
| Indigenous statistics | S2,S6 | C | strong |
| Indira Chatterji | S1,S9 | Start | strong |
| Indirect inference | S2,S5 | Start | strong |
| Indirect utility function | S4,S5,S9 | | strong |
| Indiscernibles | S1,S6,S8 | Start | strong |
| Indiscrete category | S1,S5,S6 | Stub | strong |
| Indistinguishability obfuscation | S2,S6 | C | strong |
| Indistinguishable particles | S3,S4,S8,S9 | C | strong |
| Individual pieces set | S1,S6 | Start | strong |
| Indranil Biswas | S1,S9 | Stub | strong |
| Induced character | S1,S5,S6,S9 | Stub | strong |
| Induced homomorphism | S1,S6,S9 | Start | strong |
| Induced metric | S1,S3,S5,S6,S8,S9 | Start | strong |
| Induced path | S1,S5,S6,S8,S9 | C | strong |
| Induced representation | S1,S4,S5,S6,S8,S9 | Start | strong |
| Induced subgraph | S1,S4,S5,S6,S8,S9 | Start | strong |
| Induced subgraph isomorphism problem | S1,S5,S6,S8,S9 | Start | strong |
| Inductance | S3,S4,S5,S6 | B | strong |
| Induction puzzles | S1,S2,S5,S6,S8,S9 | | strong |
| Induction, bounding and least number principles | S1,S6,S9 | Start | strong |
| Induction-induction | S1,S6 | Start | strong |
| Induction-recursion | S1,S6 | Start | strong |
| Inductive dimension | S1,S4,S5,S6,S8 | Start | strong |
| Inductive logic programming | S1,S3,S9 | C | strong |
| Inductive probability | S2,S6,S9 | Start | strong |
| Inductive reasoning | S2,S6,S8,S9 | C | strong |
| Inductive set | S1,S5,S6,S8,S9 | Stub | strong |
| Inductive tensor product | S1,S5,S6,S8,S9 | Start | strong |
| Inductive type | S1,S3,S4,S5,S6 | Start | strong |
| Indulata Sukla | S1 | Start | strong |
| Industrial process control | S2,S3,S6,S8,S9 | Start | strong |
| Industrial-grade prime | S1,S2,S6,S8,S9 | Stub | strong |
| Ineffable cardinal | S1,S6,S8 | Stub | strong |
| Ineke Stoop | S2 | Start | strong |
| Inelastic collision | S3,S4 | Start | strong |
| Inellipse | S1,S8 | Start | strong |
| Inequalities in information theory | S1,S4,S6,S8,S9 | Start | strong |
| Inequality (mathematics) | S1,S5,S6,S8,S9 | C | strong |
| Inequation | S1,S5,S6,S8,S9 | Start | strong |
| Inequity aversion | S6 | | S6 near |
| Inertia stack | S1,S5,S6 | Stub | strong |
| Inertial frame of reference | S3,S4,S6,S8 | B | strong |
| Inertial manifold | S1,S3,S4,S6 | Start | strong |
| Inexact differential equation | S1,S5,S6,S9 | Stub | strong |
| Inference | S2,S6,S8,S9 | C | strong |
| Infiltration (hydrology) | S3,S4 | C | strong |
| Infimum and supremum | S1,S4,S5,S6,S8 | Start | strong |
| Infinitary combinatorics | S1,S5,S6,S8,S9 | Start | strong |
| Infinitary logic | S1,S2,S4,S5,S6,S8,S9 | Start | strong |
| Infinite alleles model | S4,S5,S6 | | strong |
| Infinite broom | S1,S5,S6,S8,S9 | Stub | strong |
| Infinite compositions of analytic functions | S1,S4,S5,S6,S8,S9 | C | strong |
| Infinite conjugacy class property | S1,S6 | Stub | strong |
| Infinite difference method | S1,S3,S6,S9 | Stub | strong |
| Infinite dihedral group | S1,S6,S9 | Stub | strong |
| Infinite divisibility | S6,S8 | | S6 near |
| Infinite divisibility (probability) | S1,S2,S4,S5,S9 | Start | strong |
| Infinite element method | S1,S3,S6,S8,S9 | Stub | strong |
| Infinite expression | S1,S5,S6,S8,S9 | Start | strong |
| Infinite group | S1,S5,S6,S8,S9 | Stub | strong |
| Infinite loop space machine | S1,S4,S5,S6,S8 | Stub | strong |
| Infinite monkey theorem | S1,S2,S5,S6,S8,S9 | B | strong |
| Infinite monkey theorem in popular culture | S1 | B | strong |
| Infinite product | S1,S4,S5,S6,S8,S9 | Start | strong |
| Infinite regress | S2,S5,S6,S8,S9 | C | strong |
| Infinite set | S1,S4,S5,S6,S8,S9 | Start | strong |
| Infinite sites model | S4,S6 | | strong |
| Infinite skew polygon | S1,S8 | Start | strong |
| Infinite-dimensional Chern–Simons theory | S1,S6 | Stub | strong |
| Infinite-dimensional holomorphy | S1,S4,S8 | Start | strong |
| Infinite-dimensional Lebesgue measure | S1,S4,S5,S6,S8,S9 | Start | strong |
| Infinite-dimensional optimization | S1,S6,S8,S9 | Start | strong |
| Infinite-dimensional sphere | S1,S6,S9 | Start | strong |
| Infinite-dimensional vector function | S1,S6,S9 | Start | strong |
| Infinite-order apeirogonal tiling | S1,S6,S8 | Start | strong |
| Infinite-order hexagonal tiling | S1,S6,S8 | Start | strong |
| Infinite-order pentagonal tiling | S1,S6,S8 | Stub | strong |
| Infinite-order square tiling | S1,S6,S8 | Start | strong |
| Infinite-order triangular tiling | S1,S6,S8 | Start | strong |
| Infinitely near point | S1,S6,S9 | Start | strong |
| Infinitesimal | S1,S5,S6,S8,S9 | C | strong |
| Infinitesimal cohomology | S1,S6 | Stub | strong |
| Infinitesimal generator (stochastic processes) | S1,S4,S9 | Start | strong |
| Infinitesimal rotation matrix | S1,S3,S6,S9 | Start | strong |
| Infinitesimal strain theory | S3,S4,S5,S6,S8 | Start | strong |
| Infinitesimal transformation | S1,S6,S8,S9 | Stub | strong |
| Infinitism | S6 | | S6 near |
| Infinity | S1,S2,S5,S6,S8,S9 | C | strong |
| Infinity (philosophy) | S2,S6 | Start | strong |
| Infinity and the Mind | S1,S5 | Start | strong |
| Infinity Laplacian | S1,S6 | Start | strong |
| Infinity mirror | S6 | | S6 near |
| Infinity plus one | S1,S6 | List | strong |
| Infinity symbol | S1,S5,S6,S8,S9 | GA | strong |
| Infinity-Borel set | S1,S6,S8,S9 | Start | strong |
| Infinityplusone | S1 | Start | strong |
| Infix notation | S1,S6,S8,S9 | Start | strong |
| Inflation in India | S2 | Start | strong |
| Inflation-restriction exact sequence | S1,S6,S9 | Stub | strong |
| Inflection point | S1,S4,S5,S6,S8,S9 | C | strong |
| Influence diagram | S2,S9 | C | strong |
| Influence of nonstandard analysis | S1,S6,S9 | Start | strong |
| Influential observation | S1,S2,S6 | Start | strong |
| Info-gap decision theory | S2,S6,S9 | C | strong |
| Info-metrics | S1,S2,S6,S9 | C | strong |
| Infodemic | S2 | C | strong |
| Infomax | S1 | Stub | strong |
| InfoQ | S2,S6 | Stub | strong |
| Informal fallacy | S2,S8,S9 | B | strong |
| Informal inferential reasoning | S2 | Start | strong |
| Informal logic | S1,S2,S8,S9 | B | strong |
| Informal mathematics | S1,S2,S6,S8,S9 | Start | strong |
| Informant function | S1,S2,S4,S5 | Start | strong |
| Informatics | S2,S3,S6,S8 | C | strong |
| Information | S1,S3,S5,S6,S8 | C | strong |
| Information bottleneck method | S1,S2,S5 | C | strong |
| Information content | S3,S4,S5,S6 | | strong |
| Information diagram | S1,S6,S9 | Stub | strong |
| Information dimension | S1,S3,S6 | B | strong |
| Information distance | S2,S5,S9 | C | strong |
| Information field theory | S1,S9 | C | strong |
| Information flow (information theory) | S1,S6 | Start | strong |
| Information fluctuation complexity | S2,S3,S6 | C | strong |
| Information gain ratio | S2,S6 | Stub | strong |
| Information geometry | S1,S2,S4,S5,S6,S8,S9 | C | strong |
| Information integration | S2 | Start | strong |
| Information leakage | S2,S6 | Start | strong |
| Information matrix test | S2 | Stub | strong |
| Information projection | S1,S6 | Stub | strong |
| Information ratio | S2,S6,S9 | Start | strong |
| Information security | S2,S3,S6 | B | strong |
| Information set (game theory) | S1,S6 | Start | strong |
| Information source (mathematics) | S1,S2,S6,S9 | Stub | strong |
| Information theory | S1,S2,S3,S4,S5,S6,S8,S9 | B | strong |
| Information theory and measure theory | S1,S5,S6 | Start | strong |
| Information-based complexity | S1,S3,S4 | Start | strong |
| Information-theoretic security | S2,S4,S6 | Start | strong |
| Infra-exponential | S1,S6 | Stub | strong |
| Infrabarrelled space | S1,S6,S8,S9 | Stub | strong |
| Infrastructure (number theory) | S1,S6,S9 | Start | strong |
| Ingeborg Seynsche | S1 | Start | strong |
| Ingebrigt Johansson | S1,S8,S9 | Start | strong |
| Ingleton's inequality | S1,S5,S6,S8,S9 | C | strong |
| Ingo Althöfer | S1,S6 | Start | strong |
| Ingram Olkin | S1,S2,S8,S9 | Start | strong |
| Ingrid C. Kildegaard | S2,S8 | Stub | strong |
| Ingrid Daubechies | S1,S3,S8,S9 | B | strong |
| Ingrid Rewitzky | S1 | Start | strong |
| Ingrid Van Keilegom | S2,S8 | Start | strong |
| Inhabited set | S1,S5,S6,S8,S9 | Start | strong |
| Inherent bias | S2 | Stub | strong |
| Inherent zero | S1,S2 | Stub | strong |
| Inhomogeneous electromagnetic wave equation | S3,S4,S5,S6,S9 | Start | strong |
| Initial algebra | S1,S4,S6,S9 | Start | strong |
| Initial and terminal objects | S1,S4,S5,S6,S8,S9 | Start | strong |
| Initial condition | S1,S5,S6,S9 | Start | strong |
| Initial mass function | S4 | | strong |
| Initial topology | S1,S4,S6,S8,S9 | Start | strong |
| Initial value formulation (general relativity) | S3,S4,S8 | Start | strong |
| Initial value problem | S1,S4,S5,S8 | Start | strong |
| Initial value theorem | S1,S4,S5,S6,S8,S9 | Stub | strong |
| Initialization vector | S2,S6 | C | strong |
| Initialized fractional calculus | S1,S6 | Start | strong |
| Injection locking | S3,S6 | | S6 near |
| Injective function | S1,S4,S5,S6,S8,S9 | C | strong |
| Injective hull | S1,S4,S5,S6,S8 | Start | strong |
| Injective metric space | S1,S6 | Start | strong |
| Injective module | S1,S4,S5,S6,S8,S9 | B | strong |
| Injective object | S1,S4,S5,S6,S8,S9 | Start | strong |
| Injective sheaf | S1,S5,S6,S9 | Start | strong |
| Injective tensor product | S1,S4,S5,S6,S8,S9 | C | strong |
| Injury prevention | S2,S6,S9 | Start | strong |
| InMoment | S2 | Start | strong |
| Inner automorphism | S1,S4,S5,S6,S8,S9 | C | strong |
| Inner form | S1,S6,S9 | Stub | strong |
| Inner measure | S1,S4,S6 | Start | strong |
| Inner model | S1,S4,S6,S8 | Start | strong |
| Inner model theory | S1,S5,S6,S8 | Start | strong |
| Inner product space | S1,S4,S5,S6,S8 | B | strong |
| Innermost stable circular orbit | S4,S5 | | strong |
| Innovation (signal processing) | S1,S2,S9 | Stub | strong |
| Innovation method | S2 | B | strong |
| Innumeracy (book) | S1,S5,S6,S9 | Start | strong |
| Inoue surface | S1,S4,S8 | Start | strong |
| Inoue–Hirzebruch surface | S1,S5,S8 | Stub | strong |
| Input-to-state stability | S4,S6 | | strong |
| Input–output model | S4,S5,S9 | | strong |
| Inquiry | S2,S8,S9 | Start | strong |
| Inquiry: Critical Thinking Across the Disciplines | S2 | | strong |
| Inquisitive semantics | S2,S6,S8,S9 | Start | strong |
| Inscribed angle | S1,S4,S5,S6,S8,S9 | Start | strong |
| Inscribed figure | S1,S6,S8,S9 | Start | strong |
| Inscribed sphere | S1,S5,S6,S9 | Start | strong |
| Inscribed square in a triangle | S1,S6,S9 | Start | strong |
| Inscribed square problem | S1,S4,S5,S6,S8,S9 | C | strong |
| Inserter category | S1,S6 | Stub | strong |
| Insertion sort | S3,S4,S5,S6 | B | strong |
| Inshi no heya | S1,S5 | Start | strong |
| Insolubilia | S2,S6,S8 | Start | strong |
| Instant centre of rotation | S3,S4,S6,S9 | C | strong |
| Instant Insanity | S1,S6,S8 | Start | strong |
| Instantaneous phase and frequency | S1,S6,S9 | Start | strong |
| Instantiation principle | S2 | Start | strong |
| Instanton | S3,S4,S5,S6,S8,S9 | B | strong |
| Instantons and Four-Manifolds | S1,S9 | Start | strong |
| Institut de mathématiques de Jussieu – Paris Rive Gauche | S1,S9 | Start | strong |
| Institut de Mathématiques de Toulouse | S1,S9 | Stub | strong |
| Institut des hautes études scientifiques | S1,S3,S8,S9 | C | strong |
| Institut Henri Poincaré | S1,S8,S9 | Start | strong |
| Institut national d'études démographiques | S2 | Start | strong |
| Institute and Faculty of Actuaries | S2 | Start | strong |
| Institute for Advanced Study | S1,S9 | C | strong |
| Institute for Computational and Experimental Research in Mathematics | S1,S9 | Stub | strong |
| Institute for Logic, Language and Computation | S2,S9 | Stub | strong |
| Institute for Mathematical Research | S1,S9 | Stub | strong |
| Institute for Mathematics and its Applications | S1,S9 | Start | strong |
| Institute for Pure and Applied Mathematics | S1,S9 | Start | strong |
| Institute of Actuaries | S2,S8 | Start | strong |
| Institute of Actuaries of France | S2 | Stub | strong |
| Institute of Applied Physics and Computational Mathematics | S1,S3 | Stub | strong |
| Institute of Combinatorics and its Applications | S1,S8,S9 | Start | strong |
| Institute of Mathematical Problems of Biology | S1,S6 | Start | strong |
| Institute of Mathematical Sciences (Spain) | S1,S9 | Start | strong |
| Institute of Mathematical Sciences, Chennai | S1,S8,S9 | Start | strong |
| Institute of Mathematics (National Academy of Sciences of Belarus) | S1,S9 | Stub | strong |
| Institute of Mathematics and its Applications | S1,S8,S9 | C | strong |
| Institute of Mathematics of National Academy of Sciences of Armenia | S1,S6 | Start | strong |
| Institute of Mathematics of the Polish Academy of Sciences | S1 | Stub | strong |
| Institute of Mathematics of the Romanian Academy | S1,S9 | Start | strong |
| Institute of Mathematics, Physics, and Mechanics | S1,S3 | Stub | strong |
| Institute of Mathematics, UFRJ | S1 | Start | strong |
| Institute of Statistical Mathematics | S1,S2 | Stub | strong |
| Institute of Statisticians | S2 | Start | strong |
| Institute of Statistics (Albania) | S2 | Stub | strong |
| Institute of Statistics and Economic Studies | S2 | Stub | strong |
| Institution (computer science) | S3,S6,S8 | | S6 near |
| Institutional model theory | S1,S6,S8,S9 | Start | strong |
| Institutional review board | S2 | C | strong |
| Institutiones calculi integralis | S1,S8,S9 | Stub | strong |
| Instituto Argentino de Matemática | S1 | Stub | strong |
| Instituto de Investigaciones en Matemáticas Aplicadas y Sistemas | S1 | Start | strong |
| Instituto Nacional de Estatística (Cape Verde) | S2 | Stub | strong |
| Instituto Nacional de Estatística (São Tomé and Príncipe) | S2 | Stub | strong |
| Instituto Nacional de Matemática Pura e Aplicada | S1,S9 | C | strong |
| Instrumental variables | S1,S2,S4,S5,S6,S9 | B | strong |
| Insular biogeography | S4 | | strong |
| Integer | S1,S4,S5,S6,S8,S9 | C | strong |
| Integer broom topology | S1,S6,S8 | Start | strong |
| Integer circuit | S6,S8 | | S6 near |
| Integer complexity | S1,S5,S6 | Start | strong |
| Integer factorization | S1,S2,S4,S5,S6,S8,S9 | B | strong |
| Integer factorization records | S1,S2,S6,S9 | Start | strong |
| Integer lattice | S1,S5,S6,S8,S9 | Start | strong |
| Integer matrix | S1,S5,S6,S8,S9 | Start | strong |
| Integer partition | S1,S4,S5,S6,S8,S9 | C | strong |
| Integer points in convex polyhedra | S1,S3,S6,S9 | Start | strong |
| Integer programming | S1,S4,S5,S6,S8,S9 | C | strong |
| Integer relation algorithm | S1,S6 | Start | strong |
| Integer sequence | S1,S5,S6,S8,S9 | Start | strong |
| Integer square root | S1,S3,S5,S6,S8,S9 | Start | strong |
| Integer triangle | S1,S5,S6,S8,S9 | B | strong |
| Integer-valued function | S1,S5,S6,S9 | Start | strong |
| Integer-valued polynomial | S1,S4,S6,S8,S9 | Start | strong |
| Integrability conditions for differential systems | S1,S5,S6,S8,S9 | Start | strong |
| Integrable algorithm | S1,S6,S9 | Stub | strong |
| Integrable module | S1,S6,S8 | Stub | strong |
| Integrable system | S1,S3,S4,S5,S6,S8,S9 | C | strong |
| Integral | S1,S4,S5,S6,S8,S9 | B | strong |
| Integral closure of an ideal | S1,S4,S5,S6,S8,S9 | Start | strong |
| Integral cryptanalysis | S2,S6 | | strong |
| Integral curve | S1,S4,S6,S8,S9 | B | strong |
| Integral domain | S1,S4,S5,S6,S8,S9 | C | strong |
| Integral element | S1,S4,S6,S8,S9 | C | strong |
| Integral equation | S1,S4,S5,S6,S8,S9 | C | strong |
| Integral Equations and Operator Theory | S1,S6,S8,S9 | Stub | strong |
| Integral geometry | S1,S4,S5,S6,S8,S9 | Start | strong |
| Integral graph | S1,S5,S6,S9 | Start | strong |
| Integral linear operator | S1,S6,S8,S9 | Start | strong |
| Integral of a correspondence | S1,S6 | Start | strong |
| Integral of inverse functions | S1,S6,S8,S9 | C | strong |
| Integral of secant cubed | S1,S6,S8,S9 | C | strong |
| Integral of the secant function | S1,S5,S6,S8,S9 | B | strong |
| Integral operator | S1,S4,S5,S6,S8,S9 | List | strong |
| Integral polytope | S1,S4,S6,S9 | C | strong |
| Integral probability metric | S2,S6,S9 | C | strong |
| Integral symbol | S1,S6,S8,S9 | Start | strong |
| Integral test for convergence | S1,S4,S5,S6,S8,S9 | C | strong |
| Integral transform | S1,S4,S5,S8,S9 | Start | strong |
| Integrally closed domain | S1,S4,S5,S6,S8,S9 | C | strong |
| Integrally convex set | S1,S6 | Start | strong |
| Integraph | S1,S6,S9 | Start | strong |
| Integrated Encryption Scheme | S2,S6 | Start | strong |
| Integrated Household Survey | S2 | Stub | strong |
| Integrated mathematics | S1,S6,S9 | Start | strong |
| Integrated Windows Authentication | S2 | Start | strong |
| Integrating factor | S1,S4,S5,S8,S9 | Start | strong |
| Integration along fibers | S1,S5,S6,S8,S9 | Start | strong |
| Integration by parts | S1,S4,S5,S6,S8,S9 | C | strong |
| Integration by parts operator | S1,S5,S6 | Stub | strong |
| Integration by reduction formulae | S1,S4,S5,S6,S8,S9 | Start | strong |
| Integration by substitution | S1,S4,S5,S6,S8,S9 | C | strong |
| Integration using Euler's formula | S1,S5,S6,S8,S9 | C | strong |
| Integration using parametric derivatives | S1,S6,S8,S9 | Stub | strong |
| Integrator | S3,S6,S9 | C | S6 near |
| Integro-differential equation | S1,S4,S6,S8,S9 | Start | strong |
| Intel Cascade Cipher | S2 | Start | strong |
| Intelligence quotient | S2,S6 | B | strong |
| Intension | S2,S8,S9 | Start | strong |
| Intensional logic | S2,S5,S6,S8,S9 | Start | strong |
| Intensity (measure theory) | S1,S6 | Start | strong |
| Intensity measure | S1,S5,S6,S9 | Stub | strong |
| Intensity-duration-frequency curve | S3,S6 | Start | S6 near |
| Intensive and extensive properties | S3,S4,S6 | Start | strong |
| Intention-to-treat analysis | S1,S2 | Start | strong |
| Intentional Logic | S2 | Stub | strong |
| Intentionality bias | S2 | C | strong |
| Inter-rater reliability | S1,S2,S9 | C | strong |
| Inter-universal Teichmüller theory | S1,S5,S6,S9 | C | strong |
| Interacting particle system | S2,S4,S6,S9 | Start | strong |
| Interaction (statistics) | S2,S5,S6,S8,S9 | C | strong |
| Interaction information | S1,S2,S6 | Start | strong |
| Interaction picture | S3,S4,S5,S8 | Start | strong |
| Interactions of actors theory | S2,S6 | B | strong |
| Interactive computation | S1,S3,S6,S8 | Stub | strong |
| Interactive Decision Maps | S1,S2,S3,S6 | C | strong |
| Interactive Mathematics Program | S1,S6,S9 | C | strong |
| Interactive proof system | S1,S2,S3,S4,S5,S8 | Start | strong |
| Intercensal estimate | S2 | Stub | strong |
| Intercept theorem | S1,S4,S5,S6,S8,S9 | Start | strong |
| Interchange lemma | S1,S3,S6,S8 | Stub | strong |
| Interchange of limiting operations | S1,S6,S9 | Start | strong |
| Interclass correlation | S2 | Stub | strong |
| Interdecile range | S1,S2 | Start | strong |
| Interdependence theory | S6 | | S6 near |
| Interesting number paradox | S1,S5,S6,S8,S9 | Start | strong |
| Interface conditions for electromagnetic fields | S3,S4 | Start | strong |
| Interim analysis | S1,S2 | Stub | strong |
| Interior (topology) | S1,S4,S5,S6,S8,S9 | Start | strong |
| Interior algebra | S1,S2,S4,S6,S8,S9 | B | strong |
| Interior extremum theorem | S1,S4,S5,S6,S8,S9 | C | strong |
| Interior product | S1,S5,S6,S8,S9 | Start | strong |
| Interior Schwarzschild metric | S3,S4,S8 | C | strong |
| Interior-point method | S1,S3,S4,S5,S6,S8 | Start | strong |
| Interleave sequence | S1,S6,S9 | Stub | strong |
| Interleaving distance | S1,S5,S6 | Start | strong |
| Interlock protocol | S2 | C | strong |
| Interlocking interval topology | S1,S6,S8,S9 | Stub | strong |
| Intermediate Jacobian | S1,S5,S8,S9 | Stub | strong |
| Intermediate logic | S1,S5,S6,S8,S9 | Start | strong |
| Intermediate Math League of Eastern Massachusetts | S1 | Stub | strong |
| Intermediate value theorem | S1,S4,S5,S6,S8,S9 | Start | strong |
| Intermittency | S3,S4,S6,S9 | Stub | strong |
| Internal and external angles | S1,S5,S6,S8,S9 | Start | strong |
| Internal category | S1,S5,S6,S8,S9 | Stub | strong |
| Internal consistency | S2,S6 | Start | strong |
| Internal energy | S3,S4,S5,S6,S8,S9 | B | strong |
| Internal set | S1,S5,S6,S8,S9 | Stub | strong |
| Internal set theory | S1,S4,S5,S6,S8,S9 | Start | strong |
| Internal validity | S2,S8,S9 | C | strong |
| Internal wave | S3,S4 | C | strong |
| Internal wave breaking | S1,S3 | C | strong |
| International Actuarial Association | S2 | Start | strong |
| International Affective Picture System | S2,S6 | Start | strong |
| International Association for Computing and Philosophy | S2 | Stub | strong |
| International Association for Cryptologic Research | S2,S8 | Start | strong |
| International Association for Mathematical Geosciences | S1,S9 | C | strong |
| International Association for Official Statistics | S2 | Stub | strong |
| International Association for Statistical Education | S1,S2,S6 | Stub | strong |
| International Association of Mathematical Physics | S1,S3,S6,S8,S9 | Start | strong |
| International Astrostatistics Association | S2 | Start | strong |
| International Centre for Mathematical Sciences | S1,S9 | Stub | strong |
| International Centre for Sports Studies | S2 | Start | strong |
| International Commission on Mathematical Instruction | S1,S6,S8,S9 | Start | strong |
| International Commission on the History of Mathematics | S1,S9 | Start | strong |
| International Conference on Fibonacci Numbers and their Applications | S1,S6 | Start | strong |
| International Conference on Formal Power Series and Algebraic Combinatorics | S1,S6,S9 | Stub | strong |
| International Conference on Technology in Collegiate Mathematics | S1,S6 | Stub | strong |
| International Congress of Actuaries | S2,S6 | Stub | strong |
| International Congress of Chinese Mathematicians | S1,S9 | Start | strong |
| International Congress of Mathematicians | S1,S5,S6,S8,S9 | C | strong |
| International Congress on Industrial and Applied Mathematics | S1,S6,S9 | Start | strong |
| International Congress on Mathematical Physics | S1,S3,S6,S9 | Stub | strong |
| International Council for Industrial and Applied Mathematics | S1,S6,S8,S9 | Start | strong |
| International Crime Victims Survey | S2 | Stub | strong |
| International Data Encryption Algorithm | S2,S5,S8 | C | strong |
| International Encyclopedia of Statistical Science | S2 | Stub | strong |
| International Geomagnetic Reference Field | S3,S4 | Stub | strong |
| International Journal of Data Science and Analytics | S2,S3 | Stub | strong |
| International Journal of Geometry | S1,S9 | Stub | strong |
| International Journal of Science and Mathematics Education | S1 | Stub | strong |
| International Linear Algebra Society | S1,S6,S8,S9 | B | strong |
| International Mathematical Modeling Challenge | S1,S8,S9 | C | strong |
| International Mathematical Olympiad | S1,S8,S9 | GA | strong |
| International Mathematical Olympiad selection process | S1,S9 | List | strong |
| International Mathematical Union | S1,S8,S9 | C | strong |
| International Prize in Statistics | S2,S9 | Start | strong |
| International rankings of North Korea | S2 | List | strong |
| International rankings of Uruguay | S2 | List | strong |
| International Slide Rule Museum | S1 | Start | strong |
| International Social Survey Programme | S2,S6 | C | strong |
| International Society for Analysis, its Applications and Computation | S1,S8 | Start | strong |
| International Society for Bayesian Analysis | S1,S8,S9 | Stub | strong |
| International Society for Mathematical Sciences | S1,S8,S9 | Stub | strong |
| International Union of History and Philosophy of Science | S2 | | strong |
| International Women in Mathematics Day | S1 | Start | strong |
| International Workshop on Operator Theory and its Applications | S1,S6,S9 | C | strong |
| Internet censorship circumvention | S2 | C | strong |
| InterPlanetary File System | S2 | C | strong |
| Interplanetary Transport Network | S3,S6,S9 | Start | S6 near |
| Interpolation | S1,S5,S6,S8 | B | strong |
| Interpolation attack | S2,S6 | | strong |
| Interpolation inequality | S1,S6,S9 | Start | strong |
| Interpolation space | S1,S4,S9 | Start | strong |
| Interpolative decomposition | S1,S6 | Start | strong |
| Interpretability | S1,S2,S6,S8,S9 | Stub | strong |
| Interpretability logic | S2,S6,S8,S9 | Stub | strong |
| Interpretation (logic) | S1,S2,S5,S6,S8 | Start | strong |
| Interpretation (model theory) | S1,S4,S5,S6,S8 | Start | strong |
| Interpretation (philosophy) | S2 | Start | strong |
| Interprime | S1,S5,S6,S8,S9 | Stub | strong |
| Interquartile mean | S2,S6 | Start | strong |
| Interquartile range | S2,S5,S8,S9 | Start | strong |
| Interrupted time series | S1,S2 | Stub | strong |
| Intersecting chords theorem | S1,S4,S5,S8,S9 | Start | strong |
| Intersecting secants theorem | S1,S4,S5,S8,S9 | Start | strong |
| Intersection | S1,S5 | Start | strong |
| Intersection (geometry) | S1,S6,S8,S9 | C | strong |
| Intersection (set theory) | S1,S4,S5,S6,S8,S9 | C | strong |
| Intersection curve | S1,S6 | Start | strong |
| Intersection form of a 4-manifold | S1,S4,S5,S6,S9 | Start | strong |
| Intersection graph | S1,S8 | C | strong |
| Intersection homology | S1,S5,S6,S8,S9 | C | strong |
| Intersection non-emptiness problem | S1,S3,S8 | C | strong |
| Intersection number | S1,S4,S5,S6,S8 | C | strong |
| Intersection number (graph theory) | S1,S5,S6,S8 | GA | strong |
| Intersection of a polyhedron with a line | S1,S9 | Start | strong |
| Intersection theory | S1,S4,S5,S6,S8 | Start | strong |
| Intersection type | S1,S3,S6 | Start | strong |
| Intersection type discipline | S1,S6 | Start | strong |
| Interval (mathematics) | S1,S4,S5,S6,S8,S9 | C | strong |
| Interval arithmetic | S1,S4,S5,S6,S8,S9 | B | strong |
| Interval coloring | S1,S6 | Stub | strong |
| Interval contractor | S1,S6,S8,S9 | Start | strong |
| Interval edge coloring | S1,S6 | C | strong |
| Interval estimation | S2,S8,S9 | Start | strong |
| Interval exchange transformation | S1,S3,S4,S6 | Start | strong |
| Interval finite element | S1,S8 | C | strong |
| Interval graph | S1,S5,S6,S8,S9 | C | strong |
| Interval order | S1,S4,S5,S6,S9 | Stub | strong |
| Interval predictor model | S1,S6 | C | strong |
| Interval propagation | S1,S6,S8 | Start | strong |
| Interviewer effect | S2 | Stub | strong |
| Intra-rater reliability | S2,S6 | Stub | strong |
| Intraclass correlation | S2 | C | strong |
| Intransitive dice | S2,S6,S8,S9 | B | strong |
| Intransitive game | S1,S6 | Stub | strong |
| Intransitivity | S1,S5,S8 | Start | strong |
| Intrinsic equation | S1,S5,S6,S8,S9 | Start | strong |
| Intrinsic flat distance | S1,S6 | Start | strong |
| Intrinsic metric | S1,S6,S8,S9 | Start | strong |
| Introductio in analysin infinitorum | S1,S6,S8,S9 | C | strong |
| Introduction to 3-Manifolds | S1,S6,S9 | C | strong |
| Introduction to Circle Packing | S1,S6,S8,S9 | Start | strong |
| Introduction to Commutative Algebra | S1,S6,S9 | Stub | strong |
| Introduction to gauge theory | S1,S3,S6,S9 | B | strong |
| Introduction to general relativity | S1,S3,S8 | FA | strong |
| Introduction to Lattices and Order | S1,S6,S8,S9 | Start | strong |
| Introduction to Mathematical Philosophy | S1,S2,S5,S8,S9 | Start | strong |
| Introduction to Statistical Pattern Recognition | S2 | Stub | strong |
| Introduction to the mathematics of general relativity | S1,S3,S6,S9 | C | strong |
| Introduction to the Theory of Error-Correcting Codes | S1,S6,S9 | C | strong |
| Introduction to Tropical Geometry | S1,S6,S9 | Start | strong |
| Intuition | S2,S9 | C | strong |
| Intuitionism | S1,S2,S4,S5,S6,S8,S9 | C | strong |
| Intuitionistic logic | S1,S2,S4,S5,S6,S8,S9 | C | strong |
| Intuitionistic type theory | S1,S3,S4,S6,S8,S9 | Start | strong |
| Intuitive statistics | S2,S6 | C | strong |
| Invariable plane | S6 | | S6 near |
| Invariance of domain | S1,S4,S5,S6,S8,S9 | Start | strong |
| Invariant (mathematics) | S1,S3,S4,S5,S6,S8,S9 | C | strong |
| Invariant basis number | S1,S4,S6,S8,S9 | Start | strong |
| Invariant convex cone | S1,S6,S8,S9 | C | strong |
| Invariant decomposition | S1,S6 | C | strong |
| Invariant differential operator | S1,S6,S9 | Start | strong |
| Invariant estimator | S2,S6 | C | strong |
| Invariant extended Kalman filter | S1,S2,S3 | Start | strong |
| Invariant factor | S1,S5,S6,S9 | Stub | strong |
| Invariant manifold | S1,S5,S6,S9 | Start | strong |
| Invariant mass | S3,S4,S5,S6 | Start | strong |
| Invariant measure | S1,S3,S4,S6,S8,S9 | Start | strong |
| Invariant of a binary form | S1,S5,S6,S8 | C | strong |
| Invariant polynomial | S1,S5,S6,S8,S9 | Stub | strong |
| Invariant sigma-algebra | S1,S2,S6,S9 | C | strong |
| Invariant subspace | S1,S4,S5,S6,S8,S9 | C | strong |
| Invariant subspace problem | S1,S4,S5,S6,S8,S9 | C | strong |
| Invariant theory | S1,S4,S5,S6,S8 | C | strong |
| Invariants of tensors | S1,S6,S9 | Start | strong |
| Invasion percolation | S3,S4,S5,S6 | Stub | strong |
| Inventor's paradox | S2,S3 | C | strong |
| Inventory theory | S3,S4,S8 | C | strong |
| Inverse (logic) | S2,S5,S8 | Start | strong |
| Inverse bundle | S1,S6 | Stub | strong |
| Inverse consequences | S2,S6 | Start | strong |
| Inverse curve | S1,S5,S6,S8,S9 | Start | strong |
| Inverse depth parametrization | S1 | Start | strong |
| Inverse Dirichlet distribution | S1,S2 | Stub | strong |
| Inverse distance weighting | S1,S2,S4,S5,S6,S8,S9 | Start | strong |
| Inverse distribution | S1,S2,S3,S9 | Start | strong |
| Inverse dynamics-based static optimization | S1 | Start | strong |
| Inverse element | S1,S4,S5,S6,S8,S9 | Start | strong |
| Inverse function | S1,S4,S5,S6,S8,S9 | C | strong |
| Inverse function rule | S1,S4,S5,S6,S8,S9 | Start | strong |
| Inverse function theorem | S1,S4,S5,S6,S8,S9 | C | strong |
| Inverse Galois problem | S1,S4,S5,S6,S8,S9 | Start | strong |
| Inverse gambler's fallacy | S2 | Start | strong |
| Inverse gamma function | S1,S6 | Stub | strong |
| Inverse Gaussian distribution | S2,S5,S8,S9 | Start | strong |
| Inverse hyperbolic functions | S1,S4,S5,S8,S9 | Start | strong |
| Inverse image functor | S1,S5,S6,S9 | Start | strong |
| Inverse iteration | S1,S4,S5,S6,S8,S9 | Start | strong |
| Inverse kinematics | S4,S6 | | strong |
| Inverse Laplace transform | S1,S4,S5,S6,S8,S9 | Start | strong |
| Inverse limit | S1,S4,S5,S6,S8,S9 | C | strong |
| Inverse matrix gamma distribution | S2,S6,S9 | Stub | strong |
| Inverse mean curvature flow | S1,S4,S6,S9 | C | strong |
| Inverse probability | S2,S6,S8,S9 | Stub | strong |
| Inverse probability weighting | S2 | C | strong |
| Inverse problem | S4,S5,S6 | | strong |
| Inverse problem for Lagrangian mechanics | S1,S4,S6 | Start | strong |
| Inverse Pythagorean theorem | S1,S5,S6,S8,S9 | Start | strong |
| Inverse quadratic interpolation | S1,S4,S5,S6,S8 | Start | strong |
| Inverse recovery in EEG | S1,S3,S6 | Start | strong |
| Inverse scattering problem | S3,S4,S6,S9 | Stub | strong |
| Inverse scattering transform | S3,S4,S5,S6,S8,S9 | Start | strong |
| Inverse second | S1,S3 | Stub | strong |
| Inverse semigroup | S1,S4,S5,S6,S8,S9 | B | strong |
| Inverse Symbolic Calculator | S1,S6,S9 | Stub | strong |
| Inverse tangent integral | S1,S4,S5,S6,S8,S9 | C | strong |
| Inverse transform sampling | S1,S2,S4,S5,S6,S8,S9 | B | strong |
| Inverse trigonometric functions | S1,S4,S5,S6,S8,S9 | B | strong |
| Inverse-chi-squared distribution | S2,S5,S9 | Start | strong |
| Inverse-gamma distribution | S2,S5,S6,S9 | Start | strong |
| Inverse-variance weighting | S2 | Stub | strong |
| Inverse-Wishart distribution | S2,S5 | Start | strong |
| Inversion (discrete mathematics) | S1,S3,S4,S5,S6,S8,S9 | C | strong |
| Inversive congruential generator | S1,S6 | C | strong |
| Inversive distance | S1,S5,S6,S8,S9 | Start | strong |
| Inversive geometry | S1,S3,S4,S5,S6,S8,S9 | C | strong |
| Inverted bell | S1,S6,S8 | Stub | strong |
| Inverted bell curve | S1 | Stub | strong |
| Inverted Dirichlet distribution | S1,S8,S9 | Stub | strong |
| Inverted pendulum | S3,S4,S6 | B | strong |
| Inverted snub dodecadodecahedron | S1,S5,S8,S9 | Stub | strong |
| Inverter (logic gate) | S1,S3,S5,S6,S8,S9 | Start | strong |
| Invertible knot | S1,S5,S8 | C | strong |
| Invertible matrix | S1,S4,S5,S6,S8,S9 | B | strong |
| Invertible module | S6,S8 | | S6 near |
| Invertible sheaf | S1,S4,S6,S8,S9 | Start | strong |
| Investigation of 2025 Czech government Bitcoin scandal | S2 | Start | strong |
| Investigations in Numbers, Data, and Space | S1,S6,S9 | C | strong |
| Invex function | S1,S6,S8,S9 | Start | strong |
| Invincible ignorance fallacy | S2,S9 | Start | strong |
| Inviscid flow | S3,S4,S5,S8 | Start | strong |
| Invisible ink | S2,S6 | | strong |
| Involute | S1,S4,S5,S6,S8,S9 | C | strong |
| Involution (mathematics) | S1,S4,S5,S6,S8,S9 | Start | strong |
| Involutory matrix | S1,S5,S6,S9 | Start | strong |
| Ioan Mire Melik | S1 | C | strong |
| Ioana Dumitriu | S1,S8,S9 | Start | strong |
| Ioannis Kigalas | S2 | Stub | strong |
| Ioannis Kontoyiannis | S1,S2 | Start | strong |
| Ione Grogan | S1 | Start | strong |
| Ione Roseveare | S2 | Stub | strong |
| Ionescu-Tulcea theorem | S1,S2,S4,S5,S6,S8,S9 | Stub | strong |
| Ionica Smeets | S1 | Start | strong |
| Iosif Gikhman | S2 | Start | strong |
| Iosif Vorovich | S1 | Start | strong |
| IP (complexity) | S1,S3,S4,S5,S6 | Start | strong |
| IP set | S3,S4,S6,S8,S9 | Start | strong |
| Ipse dixit | S2,S9 | Start | strong |
| Ipso facto | S2,S9 | Stub | strong |
| Ipso jure | S2 | Stub | strong |
| IPUMS | S2 | Stub | strong |
| Ira Gessel | S1,S6,S8,S9 | Start | strong |
| Iranian Mathematical Society | S1,S8,S9 | Start | strong |
| Iraqi block cipher | S2 | | strong |
| Irena Lasiecka | S1,S8,S9 | Start | strong |
| Irena Peeva | S1,S8,S9 | Start | strong |
| Irena Swanson | S1,S9 | Start | strong |
| Irene Fonseca | S1,S8,S9 | Start | strong |
| Irene Hess | S2,S8 | Start | strong |
| Irene M. Gamba | S1,S8,S9 | Start | strong |
| Irene Montie | S2 | Start | strong |
| Irene Moroz | S1 | Start | strong |
| Irene Mulvey | S1 | Stub | strong |
| Irene Sabadini | S1,S9 | Start | strong |
| Irene Sciriha | S1 | Start | strong |
| Irina Mitrea | S1,S8,S9 | Start | strong |
| Irina Shevtsova | S1 | Start | strong |
| Irina Tezaur | S1 | Start | strong |
| Iris flower data set | S2,S3,S9 | Start | strong |
| Iris Runge | S1,S8,S9 | C | strong |
| Irish Statistical Association | S2 | Start | strong |
| Irmgard Flügge-Lotz | S1,S8 | B | strong |
| Iron Finance | S2 | Start | strong |
| Irrational base discrete weighted transform | S1,S6,S8,S9 | Stub | strong |
| Irrational number | S1,S4,S5,S6,S8,S9 | C | strong |
| Irrational rotation | S3,S4,S6,S8,S9 | Stub | strong |
| Irrationality measure | S1,S5,S6,S8,S9 | C | strong |
| Irrationality sequence | S1,S5,S6 | Start | strong |
| Irreducibility (mathematics) | S1,S5,S6,S9 | List | strong |
| Irreducible component | S1,S4,S5,S6,S8,S9 | Stub | strong |
| Irreducible element | S1,S4,S5,S6,S8,S9 | Start | strong |
| Irreducible fraction | S1,S4,S5,S6,S8,S9 | Start | strong |
| Irreducible ideal | S1,S4,S5,S6,S8,S9 | Start | strong |
| Irreducible polynomial | S1,S4,S5,S6,S8 | Start | strong |
| Irreducible representation | S1,S3,S4,S5,S6,S8,S9 | Start | strong |
| Irreducible ring | S1,S6,S8,S9 | C | strong |
| Irregular matrix | S3,S6,S9 | Stub | S6 near |
| Irregularity of a surface | S1,S8,S9 | Start | strong |
| Irregularity of distributions | S1,S5,S6 | Stub | strong |
| Irrelevant conclusion | S2,S8 | Start | strong |
| Irrelevant ideal | S1,S6,S8,S9 | Stub | strong |
| Irresistible force paradox | S2,S6 | Start | strong |
| Irreversible process | S3,S4,S6 | Start | strong |
| Irrigation statistics | S2 | C | strong |
| Irvin Cohen | S1,S8,S9 | Stub | strong |
| Irving Copi | S2,S5,S8,S9 | Stub | strong |
| Irving Lorge | S2,S8 | Stub | strong |
| Irving Stringham | S1,S8,S9 | Start | strong |
| Irwin Kra | S1,S8,S9 | Stub | strong |
| Irwin–Hall distribution | S2,S5 | Start | strong |
| Iryna Sushko | S1 | Start | strong |
| Irène Waldspurger | S1,S9 | Start | strong |
| Irénée-Jules Bienaymé | S2,S4,S8,S9 | Start | strong |
| Is Logic Empirical? | S2 | Start | strong |
| ISAAC (cipher) | S2,S5,S6 | Start | strong |
| Isaac Barrow | S1,S8,S9 | C | strong |
| Isaac ben Moses Eli | S1,S8 | Stub | strong |
| Isaac ibn al-Ahdab | S1,S8 | Start | strong |
| Isaac Jacob Schoenberg | S1,S5,S8,S9 | Start | strong |
| Isaac Milner | S1,S9 | Start | strong |
| Isaac Newton | S1,S3,S5,S6,S8,S9 | GA | strong |
| Isaac Newton Institute | S1,S8,S9 | Start | strong |
| Isaac of Stella | S2 | Stub | strong |
| Isaac Watts | S2 | Start | strong |
| Isaak Bacharach | S1,S8,S9 | Stub | strong |
| Isaak Moiseevich Milin | S1 | Start | strong |
| Isaak Yaglom | S1,S5,S8,S9 | Start | strong |
| Isabel Dotti | S1 | Stub | strong |
| Isabel Fernández (mathematician) | S1,S8 | Start | strong |
| Isabel Hubard Escalera | S1 | Start | strong |
| Isabel Maddison | S1,S9 | C | strong |
| Isabella Bashmakova | S1,S8,S9 | C | strong |
| Isabella Novik | S1,S8,S9 | Stub | strong |
| Isabelle (proof assistant) | S1,S3,S5,S8,S9 | Start | strong |
| Isabelle Chalendar | S1 | Start | strong |
| Isabelle Gallagher | S1,S8,S9 | Start | strong |
| Isador Lubin | S2,S8,S9 | Start | strong |
| Isador M. Sheffer | S1,S9 | Stub | strong |
| Isadore Singer | S1,S5,S8,S9 | C | strong |
| Isaiah Kantor | S1,S5,S9 | Stub | strong |
| IsaPlanner | S6,S8,S9 | | S6 near |
| Isbell duality | S1,S6,S8,S9 | Stub | strong |
| Isbell's zigzag theorem | S1,S6 | C | strong |
| Isentropic process | S3,S4,S6 | Start | strong |
| Ishango bone | S1,S5,S6,S8,S9 | B | strong |
| Ishimori equation | S1,S6,S8,S9 | Stub | strong |
| Isidor Natanson | S1,S8,S9 | Stub | strong |
| Isidore Isaac Hirschman Jr. | S1,S9 | Stub | strong |
| Ising machine | S1,S3,S6 | C | strong |
| Ising model | S3,S4,S5,S6,S8,S9 | C | strong |
| Iskander Taimanov | S1,S8 | Stub | strong |
| Ismar Volić | S1 | Start | strong |
| Ismat Beg | S1 | Start | strong |
| ISO 31-11 | S1,S6,S8,S9 | List | strong |
| ISO/IEC 19790 | S2,S6 | Stub | strong |
| ISO/IEC 7064 | S2,S6 | Stub | strong |
| ISO/IEC 80000 | S1,S3,S6,S8 | C | strong |
| Isobaric process | S3,S4,S6 | Start | strong |
| Isobel Loutit | S2 | C | strong |
| Isochoric process | S3,S4,S6 | Start | strong |
| Isochron | S1,S6 | Start | strong |
| Isocline | S1,S5,S9 | Stub | strong |
| Isoclinism of groups | S1,S5,S6 | Start | strong |
| Isodynamic point | S1,S5,S8 | C | strong |
| Isogeny | S1,S5,S6,S8,S9 | Start | strong |
| Isogeometric analysis | S4,S6,S8 | | strong |
| Isogonal conjugate | S1,S5,S6,S8,S9 | Start | strong |
| Isogonal figure | S1,S8,S9 | Start | strong |
| Isohedral figure | S1,S5,S8,S9 | Start | strong |
| Isolated point | S1,S4,S5,S6,S8,S9 | Stub | strong |
| Isolated singularity | S1,S4,S5,S6,S8,S9 | Start | strong |
| Isolating neighborhood | S1,S6 | Start | strong |
| Isolation forest | S2,S3,S9 | C | strong |
| Isolation lemma | S3,S5,S6,S8,S9 | C | S6 near |
| Isomap | S2,S6 | Start | strong |
| Isometry | S1,S4,S5,S6,S8,S9 | C | strong |
| Isometry group | S1,S5,S6,S8,S9 | Start | strong |
| Isomonodromic deformation | S1,S4,S5,S8,S9 | C | strong |
| Isomorphism | S1,S4,S5,S6,S8,S9 | C | strong |
| Isomorphism extension theorem | S1,S5,S6,S8 | Stub | strong |
| Isomorphism of categories | S1,S6,S8,S9 | Stub | strong |
| Isomorphism problem of Coxeter groups | S1,S6,S8 | Start | strong |
| Isomorphism theorems | S1,S4,S8,S9 | C | strong |
| Isomorphism-closed subcategory | S1,S6 | Start | strong |
| Isoparametric function | S1 | Stub | strong |
| Isoparametric manifold | S1,S6 | Start | strong |
| Isoperimetric dimension | S1,S6,S9 | Start | strong |
| Isoperimetric inequality | S1,S4,S5,S6,S8,S9 | Start | strong |
| Isoperimetric point | S1,S5,S8 | C | strong |
| Isoperimetric ratio | S1,S5,S6,S9 | Stub | strong |
| Isosceles set | S1,S6,S9 | Start | strong |
| Isosceles trapezoid | S1,S5,S8 | Start | strong |
| Isosceles triangle | S1,S4,S5,S8 | GA | strong |
| Isospectral | S1,S4,S6 | C | strong |
| Isostasy | S4,S6 | | strong |
| Isothermal coordinates | S1,S6,S9 | C | strong |
| Isothermal process | S3,S4,S6 | Start | strong |
| Isothermal–isobaric ensemble | S3,S4,S8,S9 | Stub | strong |
| Isotomic conjugate | S1,S5,S6,S8,S9 | Start | strong |
| Isotonic regression | S1,S2,S4,S6,S8,S9 | Start | strong |
| Isotopy of an algebra | S1 | Start | strong |
| Isotoxal figure | S1,S8,S9 | Start | strong |
| Isotropic line | S1,S6 | Start | strong |
| Isotropic measure | S1,S6 | Start | strong |
| Isotropic quadratic form | S1,S6,S8 | Start | strong |
| Isotropy | S1,S3,S6,S9 | Start | strong |
| Isotropy representation | S1,S9 | Stub | strong |
| Isotypical representation | S1,S6 | Stub | strong |
| Israel Gelfand | S1,S5,S8,S9 | C | strong |
| Israel Gohberg | S1,S8,S9 | Start | strong |
| Israel Gottlieb Canz | S2 | Start | strong |
| Israel Lyons | S1,S8 | Start | strong |
| Israel Mathematical Union | S1,S8,S9 | Stub | strong |
| Israel Michael Sigal | S1,S8,S9 | Stub | strong |
| Issai Schur | S1,S5,S6,S8,S9 | B | strong |
| Isserlis's theorem | S1,S2,S5,S6,S9 | Start | strong |
| Istanbul Center for Mathematical Sciences | S1 | Start | strong |
| Istituto Nazionale di Alta Matematica Francesco Severi | S1,S9 | Start | strong |
| Istituto per le Applicazioni del Calcolo Mauro Picone | S1,S9 | Start | strong |
| István Fenyő | S1 | Stub | strong |
| István Fáry | S1,S9 | Stub | strong |
| István Gyöngy | S1 | Stub | strong |
| István Juhász (mathematician) | S1,S8,S9 | Stub | strong |
| István Szalay | S1 | Stub | strong |
| István Vincze (mathematician) | S1,S2,S8 | Start | strong |
| Itai Benjamini | S1,S6,S8,S9 | Start | strong |
| Itala D'Ottaviano | S1,S8,S9 | Start | strong |
| Italian Mathematical Union | S1,S8,S9 | Start | strong |
| Italian National Institute of Statistics | S2 | Start | strong |
| Italian school of algebraic geometry | S1,S6,S8,S9 | Start | strong |
| Italian Statistical Society | S2 | Start | strong |
| Italo Jose Dejter | S1 | C | strong |
| Itay Neeman | S1,S8,S9 | Start | strong |
| Item analysis | S2,S6 | Stub | strong |
| Item bank | S2,S6 | Stub | strong |
| Item response theory | S2,S6,S9 | B | strong |
| Item tree analysis | S2 | C | strong |
| Item-total correlation | S2,S6 | Start | strong |
| Iterable cardinal | S1,S6,S8,S9 | Stub | strong |
| Iterated conditional modes | S1,S6,S8 | Stub | strong |
| Iterated filtering | S2,S6,S8 | Stub | strong |
| Iterated forcing | S1,S6,S8,S9 | Stub | strong |
| Iterated function | S1,S3,S4,S5,S6,S8,S9 | C | strong |
| Iterated function system | S1,S3,S4,S6,S8,S9 | C | strong |
| Iterated integral | S1,S4,S5,S6,S8,S9 | Start | strong |
| Iterated limit | S1,S4,S9 | C | strong |
| Iterated logarithm | S1,S3,S5,S6,S8,S9 | Start | strong |
| Iterated monodromy group | S1,S6,S9 | Stub | strong |
| Iteration | S1,S6,S8,S9 | Start | strong |
| Iterative deepening depth-first search | S1,S3,S5,S6,S8 | C | strong |
| Iterative learning control | S1,S3,S4,S5,S6 | Start | strong |
| Iterative method | S1,S4,S5,S6,S8,S9 | B | strong |
| Iterative proportional fitting | S2,S5,S6 | C | strong |
| Iterative refinement | S1,S4,S6,S8,S9 | Start | strong |
| Iteratively reweighted least squares | S1,S2,S8 | Start | strong |
| Itoh–Tsujii inversion algorithm | S1,S5,S6 | Stub | strong |
| ITP method | S1,S5,S6 | C | strong |
| Itzhak Gilboa | S1 | Start | strong |
| Itô calculus | S1,S2,S4,S5,S6,S8,S9 | C | strong |
| Itô diffusion | S1,S5,S9 | C | strong |
| Itô isometry | S1,S2,S4,S5,S6,S9 | Stub | strong |
| Itô's lemma | S1,S2,S5,S6,S8,S9 | Start | strong |
| Itô's theorem | S1,S5,S6,S9 | Stub | strong |
| Itô–Nisio theorem | S1,S5,S6 | Start | strong |
| Ivan Cherednik | S1,S8,S9 | Stub | strong |
| Ivan Corwin | S1,S8,S9 | Start | strong |
| Ivan Ivanov (mathematician) | S1 | Stub | strong |
| Ivan Losev (mathematician) | S1,S8,S9 | Stub | strong |
| Ivan Orlov (philosopher) | S2 | Start | strong |
| Ivan Oseledets | S1,S3 | Start | strong |
| Ivan Panin (mathematician) | S1,S8 | Stub | strong |
| Ivan Petrovsky | S1,S9 | Start | strong |
| Ivan Privalov | S1,S8 | Start | strong |
| Ivan Rival | S1,S8,S9 | Start | strong |
| Ivan Smith (mathematician) | S1,S8,S9 | Stub | strong |
| Ivan Zhegalkin | S1,S8,S9 | Stub | strong |
| Ivar Ekeland | S1,S3,S8,S9 | C | strong |
| Ivar Stakgold | S1 | Start | strong |
| Iverson bracket | S1,S5,S6,S8,S9 | C | strong |
| Ivo Babuška | S1,S9 | Start | strong |
| Ivo D. Dinov | S1,S2 | Start | strong |
| Ivo Schneider | S1,S9 | Start | strong |
| Ivor Etherington | S1,S3 | Stub | strong |
| Ivy Hooks | S1 | B | strong |
| Ivy Liu | S2 | Start | strong |
| Iván Guzmán de Rojas | S1,S3 | Start | strong |
| Iwahori subgroup | S1,S6,S9 | Start | strong |
| Iwahori–Hecke algebra | S1,S5,S6,S8,S9 | Start | strong |
| Iwasawa algebra | S1,S5,S6,S9 | Start | strong |
| Iwasawa decomposition | S1,S4,S5,S8 | Start | strong |
| Iwasawa group | S1,S5,S6,S8,S9 | Stub | strong |
| Iwasawa manifold | S1,S4,S5,S6 | Stub | strong |
| Iwasawa theory | S1,S4,S5,S6,S8 | C | strong |
| Izabela Abramowicz | S1 | Start | strong |
| Izabella Łaba | S1,S8,S9 | Start | strong |