How can I prove the following two questions: Prove using Peano's Postulates for the Natural Num

London Ware

London Ware

Answered question

2022-05-07

How can I prove the following two questions:

Prove using Peano's Postulates for the Natural Numbers that if a and b are two natural numbers such that a + b = a, then b must be 0?

Prove using Peano's Postulates for the Natural Numbers that if a and b are natural numbers then: a + b = 0 if and only if a = 0 and b = 0?

I understand the basic postulates, but not sure how to apply them to these specific questions. The questions seem so basic and obvious, but when it comes to applying the postulates I am lost.

Answer & Explanation

Abigailf91er

Abigailf91er

Beginner2022-05-08Added 13 answers

Use induction on a for the first. Use case analysis (4 cases: a = Z or S x, b = Z or S y) for the second.

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