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Walter Neumann of Barnard College / Columbia University gives a presentation at the 50th annual Cornell Topology Festival, May 7, 2012. Neumann addresses the local metric geometry at a point of a complex surface in terms of a collection of rational numbers associated to components of a refined JSJ decomposition of the 3-manifold link of the point.
The festival was organized by the Cornell University Department of Mathematics with support from the National Science Foundation.