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Title: The two-dimensional Ising model revisited

Abstract: I will describe joint work with Constantin Teleman, in which we cast topological eyes on a well-studied system in condensed matter physics.  In particular, we use the symmetry in a strong form and apply the technology of extended topological field theory.  We obtain a proof of duality, construct a new dual theory for models based on a nonabelian group, and make dynamical predictions.  The lecture will not assume any physics background.

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