Let x, y ∈ Z. Prove that x − y is even if and only x and y are of the same parity.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter2: The Integers
Section2.1: Postulates For The Integers (optional)
Problem 27E: Let x and y be in Z, not both zero, then x2+y2Z+.
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Let x, y ∈ Z. Prove that x − y is even if and only x and y are of the same parity.

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