nLab Nekrasov function

Nekrasov functions are the coefficients of the character expansion of the matrix $\tau$-function. They were introduced in

• N.Nekrasov, Seiberg-Witten prepotential from instanton counting, Adv.Theor.Math.Phys. 7 (2004) 831-864, hep-th/0206161

and play the central role in the formulation of the AGT conjecture.

• A. Belavin, V. Belavin, AGT conjecture and integrable structure of conformal field theory for c=1, arxiv/1102.0343