et K and E be the extension of a field F with   [K:F] finite and assume that both K and E are  subfields of some larger field. If K is a Galois  extension of F then KE is a Glois extension of   E and   G(KE, E)≅G(K,K∩E).

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter6: More On Rings
Section6.1: Ideals And Quotient Rings
Problem 35E: Let R be a commutative ring with unity whose only ideals are {0} and R Prove that R is a...
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Let K and E be the extension of a field F with 
 [K:F] finite and assume that both K and E are
 subfields of some larger field. If K is a Galois
 extension of F then KE is a Glois extension of 
 E and   G(KE, E)≅G(K,K∩E).

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