Difference Equations Compatible with Trigonometric KZ Differential Equations

Abstract

The trigonometric KZ equations associated with a Lie algebra $\g$ depend on a parameter $λ\in\h$ where $\h\subset\g$ is the Cartan subalgebra. We suggest a system of dynamical difference equations with respect to $λ$ compatible with the KZ equations. The dynamical equations are constructed in terms of intertwining operators of $\g$-modules.

23 pages, AmsTeX, third version, some misprints were corrected