On Orbit Closures of Borel Subgroups in Spherical Varieties

@inproceedings{Brion1999OnOC,
  title={On Orbit Closures of Borel Subgroups in Spherical Varieties},
  author={Michel Brion},
  year={1999}
}
Let F be the flag variety of a complex semi-simple group G, let H be an algebraic subgroup of G acting on F with finitely many orbits, and let V be an H-orbit closure in F . Expanding the cohomology class of V in the basis of Schubert classes defines a union V0 of Schubert varieties in F with positive multiplicities. If G is simply-laced, we show that these… CONTINUE READING