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Affine Kac-Moody algebras at the critical level and Gelfand-Dikii algebras. (English) Zbl 0925.17022

MSC:
17B67 Kac-Moody (super)algebras; extended affine Lie algebras; toroidal Lie algebras
17B37 Quantum groups (quantized enveloping algebras) and related deformations
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