Proof that (a) [F : K] = 1 if and only if F = K. (b) If

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Proof that

(a) [F : K] = 1 if and only if F = K.

(b) If [F: K] is prime, then there are no intermediate fields between F and K.

(c) If u ϵ F has degree n over K, then n divides [F: K].

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