Question: Determine whether the given map is an isomorphism of the first binary structure with the second. If it is not an isomorphism, why not?

Determine whether the given map ∅ is an isomorphism of the first binary structure with the second. If it is not an isomorphism, why not?

(Q, +) with (Q, +) where ∅(x) = x/2 for x ∈ Q

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