Let R be the relation on the set of ordered pairs of positive integers such that  ((?, ?), (?, ?)) ∈ ? if and only if a+d = b+c. Show R is an equivalence relation.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter1: Fundamentals
Section1.7: Relations
Problem 11E: Let be a relation defined on the set of all integers by if and only if sum of and is odd. Decide...
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Let R be the relation on the set of ordered pairs of positive integers such that 
((?, ?), (?, ?)) ∈ ? if and only if a+d = b+c. Show R is an equivalence relation. 

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