Tits Alternative for Closed Real Analytic 4-manifolds of Nonpositive Curvature
نویسنده
چکیده
We study subgroups of fundamental groups of real analytic closed 4-manifolds with nonpositive sectional curvature. In particular, we are interested in the following question: if a subgroup of the fundamental group is not virtually free abelian, does it contain a free group of rank two ? The technique involves the theory of general metric spaces of nonpositive curvature.
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تاریخ انتشار 2004