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Fusion algebra at a rational level and cohomology of nilpotent subalgebras of sl_2
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hep-thmath.QA
keywords
algebracohomologicalfusionlevelrationaladmissiblebyproductcalculate
abstract
We define and calculate the fusion algebra of WZW model at a rational level by cohomological methods. As a byproduct we obtain a cohomological characterization of admissible representations of $\widehat{\gtsl}_{2}$.
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