Give a one-sentence synopsis of the only if' part of Theorem 48.3. Data from Theorem 48.3: Let

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Give a one-sentence synopsis of the "only if' part of Theorem 48.3. 

Data from Theorem 48.3:

Let F be a field, and let α and β be algebraic over F with deg(α, F) = n. The map ψα :F(α) → F(β) defined by

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for c∈ F is an isomorphism of F(α) onto F(β) if and only if a and are conjugate over F.

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