Pircon kernels and up-down symmetry
Abstract
We show that a symmetry property that we call the up-down symmetry implies that the Kazhdan--Lusztig Rx-polynomials of a pircon P are a P-kernel, and we show that this property holds in the classical cases. Then, we enhance and extend to this context a duality of Deodhar in parabolic Kazhdan--Lusztig theory.
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