G. A. Noskov

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math.GR2001

Uniform Growth, Actions on Trees and $G L_{2}$

Roger C. Alperin, Guennadi A. Noskov

We use actions on trees to determine uniform exponential growth for subgroups of $G L_{2}$ .

math.GR2001

A strong Schottky Lemma for nonpositively curved singular spaces

Roger C. Alperin, Benson Farb, Guennadi A. Noskov

In this paper we give a criterion for pairs of isometries of a nonpositively curved metric space to generate a free group. This criterion holds only in singular spaces, for example…

Uniform Growth, Actions on Trees and GL2​

A strong Schottky Lemma for nonpositively curved singular spaces

Uniform Growth, Actions on Trees and $G L_{2}$