Groups not presentable by products

Details Groups not presentable by products Groups not presentable by products

2010-03-19

arxiv.org/abs/1003.3853v2

Mathematics

Group Theory

25 pages, minor changes, to appear in Groups, Geometry, and Dynamics

Scientific paper

In this paper we study obstructions to presentability by products for finitely generated groups. Along the way we develop both the concept of acentral subgroups, and the relations between presentability by products on the one hand, and certain geometric and measure or orbit equivalence invariants of groups on the other. This leads to many new examples of groups not presentable by products, including all groups with infinitely many ends, the (outer) automorphism groups of free groups, Thompson's groups, and even some elementary amenable groups.

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