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.
Non-amenable finitely presented torsion-by-cyclic groups
Published 2001 in Publications Mathématiques de l'Institut des Hautes Études Scientifiques
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2001
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Publications Mathématiques de l'Institut des Hautes Études Scientifiques
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2001-07-03
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Mathematics
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