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Proofs involving the addition of natural numbers : ウィキペディア英語版 | Proofs involving the addition of natural numbers Mathematical proofs for addition of the natural numbers: additive identity, commutativity, and associativity. These proofs are used in the article Addition of natural numbers. ==Definitions== This article will use the Peano axioms for the definitions of addition of the natural numbers, and the successor function S(a). In particular: For the proof of commutativity, it is useful to define another natural number closely related to the successor function, namely "1". We define 1 to be the successor of 0, in other words, :1 = S(0). Note that for all natural numbers ''a'',
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