Multi-Instanton Check of the Relation Between the Prepotential F and the   Modulus u in N=2 SUSY Yang-Mills Theory
  By examining multi-instantons in N=2 supersymmetric SU(2) gauge theory, we derive, on very general grounds, and to all orders in the instanton number, a relationship between the prepotential F(Phi), and the coordinate on the quantum moduli space u=<Tr Phi^2>. This relation was previously obtained by Matone in the context of the explicit Seiberg-Witten low-energy solution of the model. Our findings can be viewed as a multi-instanton check of the proposed exact results in supersymmetric gauge theory. 
N. Dorey (Swansea), V.V. Khoze (Durham) and M.P. Mattis (Los Alamos)