Question: 3. Let (S, o) be a semigroup. If for x, y S, xoy = y = yox, prove that (S,o) is an abelian group.

3. Let (S, o) be a semigroup. If for x, y S,

3. Let (S, o) be a semigroup. If for x, y S, xoy = y = yox, prove that (S,o) is an abelian group.

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