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单词 ExampleOfWellfoundedInduction
释义

example of well-founded induction


This proof of the fundamental theorem of arithmeticMathworldPlanetmath (every natural numberMathworldPlanetmath has a prime factorizationMathworldPlanetmath) affords an example of proof by well-founded induction over a well-founded relation that is not a linear order.

First note that the division relationMathworldPlanetmath is obviously well-founded. The |-minimal elements are the prime numbersMathworldPlanetmath. We detail the two steps of the proof :

  1. 1.

    If n is prime, then n is its own factorization into primes, so the assertion is true for the |-minimal elements.

  2. 2.

    If n is not prime, then n has a non-trivial factorization (by definition of not being prime), i.e. n=m, where m,n1. By inductionMathworldPlanetmath, m and have prime factorizations, the productPlanetmathPlanetmath of which is a prime factorization of n.

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更新时间:2025/5/4 22:11:19