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most citedOn the space-time curvature experienced by quasiparticle excitations in the Painleve-Gullstrand effective geometry

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math.GR2003★ 2 cited

Tits alternative for closed real analytic 4-manifolds of nonpositive curvature

Xiangdong Xie

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…