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The bounded area class of negatively curved surfaces

Frigerio, Roberto et al.
arXiv (All) · Papers
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algebraic-geometrydifferential-geometrygeometric-topology
Let $S$ be an oriented surface, possibly of infinite type, endowed with a complete Riemannian metric with pinched negative curvature. We prove that the area form defines a non-trivial class in the second bounded cohomology group of $S$, unless $S$ is diffeomorphic to the disc or the cylinder. This i
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