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arxiv: 1312.2273 · v2 · pith:XLLQ45A3new · submitted 2013-12-08 · 🧮 math.LO · math.AG

Elimination of generalised imaginaries and Galois cohomology

classification 🧮 math.LO math.AG
keywords generalisedimaginariescohomologyeliminationhrushovskialgebraicallyapplicationarticle
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The objective of this article is to characterise elimination of finite generalised imaginaries (as defined by Hrushovski) in terms of group cohomology. As an application, I consider series of Zariski geometries constructed by Hrushovski and Zilber, and indicate how their non-definability in algebraically closed fields and other theories is connected to eliminability of certain generalised imaginaries.

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