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Z-graded weak modules and regularity
Published 13 Apr 2011 in math.QA and math.RT | (1104.2369v1)
Abstract: It is proved that if any Z-graded weak module for vertex operator algebra V is completely reducible, then V is rational and C_2-cofinite. That is, V is regular. This gives a natural characterization of regular vertex operator algebras.
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