One-instanton calculations in N = 2 supersymmetric SU(Nc) Yang-Mills theory

We calculate the one-instanton contribution to the prepotential in N = 2 supersymmetric SU(Nc) Yang-Mills theory from the microscopic viewpoint. We find that the holomorphy argument simplifies the group integrations of the instanton configurations. For Nc = 3, the result agrees with the exact solution.