Tangent cones to Schubert varieties for Kac--Moody groups

Stepan Bondar, Mikhail Ignatev

Let $G$ be the affine Kac--Moody group of type ${\tilde{A}}_{n-1}$, $B$ be an Iwahori subgroup in $G$, $\mathcal{F}=G/B$ be the flag variety, and $W$ be the Weyl group of $G$. Giv…