Tangent cones to Schubert varieties in types $A_n$, $B_n$ and $C_n$

Mikhail A. Bochkarev, Mikhail V. Ignatyev, Aleksandr A. Shevchenko

Let $G$ be a complex reductive group, $T$ be a maximal torus of $G$, $B$ be a Borel subgroup of $G$ containing $T$, $W$ be the Weyl group of $G$ with respect to $T$. To each elemen…