F-regularity of large Schubert varieties

Details F-regularity of large Schubert varieties F-regularity of large Schubert varieties

2004-08-13

arxiv.org/abs/math/0408180v1

Mathematics

Algebraic Geometry

14 pages

Scientific paper

Let G denote a connected reductive algebraic group over an algebraically closed field k and let X denote a projective G x G-equivariant embedding of G. The large Schubert varieties in X are the closures of the double cosets BgB, where B denotes a Borel subgroup of G, and g is in G. We prove that these varieties are globally F-regular in positive characteristic, resp. of globally F-regular type in characteristic 0. As a consequence, the large Schubert varieties are normal and

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