Andersen Filtration and Hard Lefschetz
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filtrationandersenmodulebgg-categorycoefficientsdefinedimensionsestablish
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On the space of homomorphisms from a Verma module to an indecomposable tilting module of the BGG-category O we define a natural filtration following Andersen and establish a formula expressing the dimensions of the filtration steps in terms of coefficients of Kazhdan-Lusztig polynomials.
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