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# Michael Lipnowski : Torsion in the cohomology of arithmetic groups

The remarkable Cheeger-Muller theorem, of differential geometric origin, provides an analytic means of studying torsion in the cohomology of Riemannian manifolds. We describe how this theorem can be applied to prove a numerical form of Langlands' base change functoriality for torsion in cohomology.

**Category**: Number Theory**Duration**: 01:04:54**Date**: September 18, 2013 at 1:55 PM-
**Tags:**seminar, UNC-Duke Number Theory Seminar

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