Let L and M be intermediate fields in the extension K F. (a) [LM: K] is
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Let L and M be intermediate fields in the extension K ⊂ F.
(a) [LM: K] is finite if and only if [L : K] and [M: K] are finite.
(b) If [LM: K] is finite, then [L : K] and [M: K] divide [LM: K] and [LM: K] ≤ [L: K][M: K].
(c) If [L : K] and [M: K] are finite and relatively prime, then [LM : K] = [L : K][M : K].
( d) If L and M are algebraic over K, then so is LM.
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Related Book For
Algebra Graduate Texts In Mathematics 73
ISBN: 9780387905181
8th Edition
Authors: Thomas W. Hungerford
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