Quantum group structure in the Fock space resolutions of sl(n) representations

We describe a complex of Wakimoto-type Fock space modules for the affine Kac-Moody algebra sl(n). The intertwining operators that build the complex are obtained from contour integrals of so-called screening operators. We show that a quantum group structure underlies the algebra of screening operators. This observation greatly facilitates the explicit determination of the intertwiners. We conjecture that the complex provides a resolution of an irreducible highest weight module in terms of Fock spaces. (orig.)