Some (non-)elimination results for curves in geometric structures

Serge Randriambololona; Sergei Starchenko

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arXiv · 1011.2432

Some (non-)elimination results for curves in geometric structures

Serge Randriambololona·Sergei Starchenko

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Abstract

We show that the first order structure whose underlying universe is $\mathbb C$ and whose basic relations are all algebraic subset of $\mathbb C^2$ does not have quantifier elimination. Since an algebraic subset of $\mathbb C ^2$ needs either to be of dimension $\leq 1$ or to have a complement of dimension $\leq 1$, one can restate the former result as a failure of quantifier elimination for planar complex algebraic curves. We then prove that removing the planarity hypothesis suffices to recover quantifier elimination: the structure with the universe $\mathbb C$ and a predicate for each algebraic subset of $\mathbb C^n$ of dimension $\leq 1$ has quantifier elimination.

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BibTeX RIS

Serge Randriambololona, Sergei Starchenko. 2010-11-10. Some (non-)elimination results for curves in geometric structures. https://arxiv.org/abs/1011.2432

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