Trigonometric weight functions as K-theoretic stable envelope maps for the cotangent bundle of a flag variety

R. Rimanyi, V. Tarasov, A. Varchenko

We consider the cotangent bundle $T^{\ast }{F}_{\lambda }$ of a $G{L}_n$ partial flag variety, $\lambda =({\lambda }_1,...,{\lambda }_N)$, $|\lambda |={\sum }_i{\lambda }_i=n$, and the torus $T=(\C^\times)^{n+1}$ equivariant K-theory algebra $…