Suppose A is the set composed of all ordered pairs of positive integers. Let R be the relation deﬁned on A where (a,
b)R(c,d) means that a + d = b + c.
(a) Prove that R is an equivalence relation.
(b) Find [(2, 4)].

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The Answer of Suppose A is the set composed of all ordered pairs of positive integers. Let R be the relation deﬁned on A where (a,
b)R(c,d) means that a + d = b + c.
(a) Prove that R is an equivalence relation.
(b) Find [(2, 4)].

Suppose a Is the Set Composed of All Ordered Pairs