The formal rigidity of the Witt and Virasoro algebras was first established by the author in [4]. The proof was based on some earlier results of the author and Goncharowa, and was not presented there. In this paper we give an elementary proof of these facts.
From fixed-energy MSA to dynamical localization: A continuing quest for elementary proofs
From the Conformal Anomaly to the Virasoro Algebra
Kac-Moody and Virasoro algebras on the two-sphere and the two-torus
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