On pseudo algebraically closed extensions of fields

Lior Bary-Soroker*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The notion of 'Pseudo Algebraically Closed (PAC) extensions' is a generalization of the classical notion of PAC fields. In this work we develop a basic machinery to study PAC extensions. This machinery is based on a generalization of embedding problems to field extensions. The main goal is to prove that the Galois closure of any proper separable algebraic PAC extension is its separable closure. As a result we get a classification of all finite PAC extensions which in turn proves the 'bottom conjecture' for finitely generated infinite fields. The secondary goal of this work is to unify proofs of known results about PAC extensions and to establish new basic properties of PAC extensions, e.g. transitiveness of PAC extensions.

Original languageEnglish
Pages (from-to)2082-2105
Number of pages24
JournalJournal of Algebra
Issue number6
StatePublished - 15 Sep 2009


FundersFunder number
Israel Science Foundation343/07


    • Embedding problem
    • Field arithmetic
    • PAC


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