Pseudo Algebraically Closed Extensions

Details Pseudo Algebraically Closed Extensions Pseudo Algebraically Closed Extensions

2009-07-16

arxiv.org/abs/0907.2892v1

Mathematics

Number Theory

PhD thesis done at Tel-Aviv University under the supervision of Prof. Dan Haran. The original thesis is written in Hebrew

Scientific paper

This PhD deals with the notion of pseudo algebraically closed (PAC) extensions of fields. It develops a group-theoretic machinery, based on a generalization of embedding problems, to study these extensions. Perhaps the main result is that although there are many PAC extensions, the Galois closure of a proper PAC extension is separably closed. The dissertation also contains the following subjects. The group theoretical counterpart of pseudo algebraically closed extensions, the so-called projective pairs. Applications to seemingly unrelated subjects, e.g., an analog of Dirichlet's theorem about primes in arithmetic progression for polynomial rings in one variable over infinite fields.

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