Question: Suppose hS , ? i has an identity element e for ? . Prove the following statement: If phi : S - > S

Suppose hS,?i has an identity element e for ?. Prove the following statement:
If \phi : S -> S0 is an isomorphism of hS,?i with S0
,?0, then \phi (e) is an identity element for
the binary operation ?0 on S

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