Hyperbolic diagram groups are free

preprint2015arXivOpen access

Abstract

In this paper, we study the so-called diagram groups. Our main result is that diagram groups are free if and only if they do not contain any subgroup isomorphic to Z2\mathbb{Z}^2. As an immediate corollary, we get that hyperbolic diagram groups are necessarily free, answering a question of Guba and Sapir.

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