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Preprint Number 208

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208. Alice Medvedev, Ramin Takloo-Bighash
An invitation to model-theoretic Galois theory
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Submission date: 20 October 2009.

Abstract:

We carry out some of Galois's work in the setting of an arbitrary first-order theory T. We replace the ambient algebraically closed field by a large model M of T, replace fields by definably closed subsets of M, assume that T codes finite sets, and obtain the fundamental duality of Galois theory matching subgroups of the Galois group of L over F with intermediate extensions. This exposition of a special case of Poizat's "Une th\'eorie de Galois imaginaire." (1983) has the advantage of requiring almost no background beyond familiarity with fields, polynomials, first-order formulae, and automorphisms.

Mathematics Subject Classification: 12F10, 03C07, 03-01, 12-01

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