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Date: 20-2-2022
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1. Zero is a number.
2. If is a number, the successor of is a number.
3. zero is not the successor of a number.
4. Two numbers of which the successors are equal are themselves equal.
5. (induction axiom.) If a set of numbers contains zero and also the successor of every number in , then every number is in .
Peano's axioms are the basis for the version of number theory known as Peano arithmetic.
Wolfram, S. A New Kind of Science. Champaign, IL: Wolfram Media, p. 1152, 2002.
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