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  "body": "\n## Summary\n\nThe successor function is the function $S \\colon \\mathbb{N} \\to \\mathbb{N}$ that sends each natural number $n$ to the next natural number, $S(n) = n + 1$.\nIt is a primitive notion of the [[Peano axioms|0QFT7Z76N5]].\n",
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