"Non UBC"@en . "DSpace"@en . "Avramidi, Grigori"@en . "2014-08-06T23:57:54Z"@en . "2013-08-08"@en . "A theorem of Gromov says that a complete finite volume Rieman- nian manifold of bounded negative curvature is the interior of a compact manifold with boundary. If, in addition, the curvature is bounded away from zero then the boundary is an aspherical manifold with virtually nilpotent fundamental group. I will discuss examples showing this is no longer true if the curvature is allowed to approach zero. Then, I will explain a recent result showing that in dimension four the boundary is aspherical. This is joint work with Yunhui Wu and Tam Nguyen Phan."@en . "https://circle.library.ubc.ca/rest/handle/2429/49431?expand=metadata"@en . "40 minutes"@en . "video/mp4"@en . ""@en . "Author affiliation: University of Chicago"@en . "10.14288/1.0043483"@en . "eng"@en . "Unreviewed"@en . "Vancouver : University of British Columbia Library"@en . "Banff International Research Station for Mathematical Innovation and Discovery"@en . "Attribution-NonCommercial-NoDerivs 2.5 Canada"@en . "http://creativecommons.org/licenses/by-nc-nd/2.5/ca/"@en . "Graduate"@en . "BIRS Workshop Lecture Videos (Banff, Alta)"@en . "Mathematics"@en . "Differential geometry"@en . "Manifolds and cell complexes"@en . "Ends of negatively curved manifolds"@en . "Moving Image"@en . "http://hdl.handle.net/2429/49431"@en .