Diophantine Geometry over Groups X: The Elementary Theory of Free Products of Groups

Details Diophantine Geometry over Groups X: The Elementary Theory of Free Products of Groups Diophantine Geometry over Groups X: The Elementary Theory of Free Products of Groups

2010-11-30

arxiv.org/abs/1012.0044v1

Mathematics

Group Theory

Scientific paper

This paper is the 10th in a sequence on the structure of sets of solutions to systems of equations over groups, projections of such sets (Diophantine sets), and the structure of definable sets over few classes of groups. In the 10th paper we answer affirmatively a question of R. L. Vaught on the elementary equivalence of free products of pairs of elementarily equivalent groups, and obtain a generalization of Tarski's problem on the elementary equivalence of non-abelian free groups. Finally, we prove that free products of stable groups is stable, generalizing a previous result on the stability of free groups.

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