Toric Schubert varieties in partial flag varieties admit an explicit combinatorial fan model via Deodhar decompositions, yielding necessary and sufficient smoothness conditions in terms of Cartan integers along with supersolvable lattice structure for certain Weyl group intervals.
Princeton University Press, Princeton, NJ, 1993
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Toric Schubert Varieties in Partial Flag Varieties
Toric Schubert varieties in partial flag varieties admit an explicit combinatorial fan model via Deodhar decompositions, yielding necessary and sufficient smoothness conditions in terms of Cartan integers along with supersolvable lattice structure for certain Weyl group intervals.