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galois theory : THE PROOFS, THE WHOLE PROOFS, ANDNOTHING BUT THE PROOFSMARK DICKINSONC ontents1. Notation and conventions12. Field extensions13. Algebraic extensions44. Splitting fields65. Normality76. Separability77. galois extensions88. Linear independence of characters109. Fixed fields1310. The Fundamental Theorem14I ve adopted a slightly different method of proof from the textbook for many ofthe galois theory results. For your reference, here s a summary of the main resultsand their proofs, without any of that pesky history and motivation or distractingexamples to get in the way.

GALOIS THEORY: THE PROOFS 3 multiplication by αmust be surjective. In particular, 1 is in the image, so 1 = αβ for some βin E. Hence αhas an inverse in E.

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