Non-amenable finitely presented torsion-by-cyclic groups

A. Ol’shanskii,M. Sapir

Published 2001 in Publications Mathématiques de l'Institut des Hautes Études Scientifiques

ABSTRACT

Abstract. – We construct a finitely presented non-amenable group without free non-cyclic subgroups thus providing a finitely presented counterexample to von Neumann’s problem. Our group is an extension of a group of finite exponent n ≫ 1 by a cyclic group, so it satisfies the identity [x,y]n = 1.

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