Show that the relation R in the set A = {1, 2, 3, 4, 5} given by R = {(a,b) : |a - b| is even}

Show that the relation R in the set A = {1, 2, 3, 4, 5} given by R = is an equivalence relation. Show that all the elements of {1, 3, 5} are related to each other and all the elements of {2, 4} are related to each other. But no element of {1, 3, 5} is related to any element of {2, 4}.

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