17. If E is an extension of F and f (x) e F[x] and if is an automorphism of E leaving every element of F fixed, prove that o must take a root of f (x) in E into a root of f (x) in E.

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17. If E is an extension of F and f (x) e F [x] and if o is
an automorphism of E leaving every element of F fixed, prove that o must
take a root of f (x) in E into a root off(x) in E.
Transcribed Image Text:17. If E is an extension of F and f (x) e F [x] and if o is an automorphism of E leaving every element of F fixed, prove that o must take a root of f (x) in E into a root off(x) in E.
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