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A generalization of intertwining operators for vertex operator algebras (1603.01326v2)
Published 4 Mar 2016 in math.QA
Abstract: We generalize the notion of an intertwining operator to N-graded weak modules over a vertex operator algebra and study their properties. We show a formula for the dimensions of these intertwining operators in terms of modules over the Zhu algebras under some conditions on N-graded weak modules.
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