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math.RT2002
Lower bounds for Kazhdan-Lusztig polynomials from patterns
Sara Billey, Tom Braden
We give a lower bound for the value at q=1 of a Kazhdan-Lustig polynomial in a Weyl group W in terms of "patterns''. This is expressed by a "pattern map" from W to W' for any parab…
math.AG2002
Hyperbolic localization of intersection cohomology
Tom Braden
For a normal variety X defined over an algebraically closed field with an action of the multiplicative group G_m, we consider the ``hyperbolic localization'' functor from D^b(X) to…