On splitting theorems for CAT(0) spaces and compact geodesic spaces of non-positive curvature

Details On splitting theorems for CAT(0) spaces and compact geodesic spaces of non-positive curvature On splitting theorems for CAT(0) spaces and compact geodesic spaces of non-positive curvature

2004-05-28

arxiv.org/abs/math/0405551v4

Mathematics

Group Theory

14 pages

Scientific paper

In this paper, we show some splitting theorems for CAT(0) spaces on which a product group acts geometrically and we obtain a splitting theorem for compact geodesic spaces of non-positive curvature. A CAT(0) group $\Gamma$ is said to be {\it rigid}, if $\Gamma$ determines the boundary up to homeomorphisms of a CAT(0) space on which $\Gamma$ acts geometrically. C.Croke and B.Kleiner have constructed a non-rigid CAT(0) group. As an application of the splitting theorems for CAT(0) spaces, we obtain that if $\Gamma_1$ and $\Gamma_2$ are rigid CAT(0) groups then so is $\Gamma_1\times \Gamma_2$.

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