Question: Problem 4. Let X = {-1, 0, 1}, and define the relation R on (X ) by A R B the sum of elements of

Problem 4. Let X = {-1, 0, 1}, and define the relation R on (X ) by A R B the sum of elements of A equals the sum of elements of B. (a) Prove that R is an equivalence relation. (b) Compute all the equivalence classes of R

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