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Paper detail

Green functions via hyperbolic localization

Let G be a reductive algebraic group, with nilpotent cone N and flag variety G/B. We construct an exact functor from perverse sheaves on N to locally constant sheaves on G/B, and we use it to study Ext-groups of simple perverse sheaves on N in terms of the cohomology of G/B. As an application, we give new proofs of some known results on stalks of perverse sheaves on N.

preprint2010arXivOpen access
Pramod N. Achar
math.RT
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Pramod N. Achar

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