Abstract
Let D be the group of orientation-preserving diffeomorphisms of the circle S1. Then D is Frechet Lie group with Lie algebra (d∞)ℝ the smooth real vector fields on S1. Let dℝ be the subalgebra of real vector fields with finite Fourier series. This lecture outlines a proof that every infinitesimally unitary projective positive-energy representation of dℝ integrates to a continuous projective unitary representation of D. This result was conjectured by V. Kac.
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