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Characterising Sobolev inequalities by controlled coarse homology and applications for hyperbolic spaces. (English) Zbl 1401.53035

The main result of the present paper establishes a Sobolev inequality characterisation for the vanishing of a fundamental class in the controlled coarse homology of Nowak-Špakula. The abstract setting corresponds to quasiconvex uniform spaces that support a local weak \((1,1)\)-Poincaré inequality. This result is applied in the framework of visual Gromov hyperbolic spaces and Carnot groups.

MSC:

53C23 Global geometric and topological methods (à la Gromov); differential geometric analysis on metric spaces
30L99 Analysis on metric spaces
58J32 Boundary value problems on manifolds