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On Mostow rigidity for variable negative curvature

Igor Belegradek

math.DGarXiv:math/0003091

Abstract

We prove a finiteness theorem for the class of complete finite volume Riemannian manifolds with pinched negative sectional curvature, fixed fundamental group, and of dimension >2. One of the key ingredients is that the fundamental group of such a manifold does not admit a small nontrivial action on an R-tree.

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