The Nil Hecke Ring and Singularity of Schubert Varieties
The Nil Hecke Ring and Singularity of Schubert Varieties
Let G be a semi-simple simply-connected complex algebraic group and T ⊂ B a maximal torus and a Borel subgroup respectively. Let ŋ= Lie T be the Cartan subalgebra of the Lie algebra Lie G, and W:= N(T)/T the Weyl group associated to the pair (G, T), where N(T) is …