Search results with tag "Galoistheory"

GaloisTheory - University of Illinois Urbana-Champaign

2 CHAPTER6. GALOISTHEORY Proof. (i) Let F 0 be the fixed field of G.Ifσis an F-automorphism of E,then by definition of F 0, σfixes everything in F 0.Thus the F-automorphisms of Gcoincide with the F 0-automorphisms of G.Now by (3.4.7) and (3.5.8), E/F 0 is Galois. By (3.5.9),the size of the Galois group of a finite Galois extension is the degree of the extension.

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