On the Seiberg-Witten Approach to electric-magnetic Duality
arXiv:hep-th/9608121
Abstract
Electric-magnetic duality allows to calculate the central charges of N=2 supersymmetric theories with massless hypermultiplets as derivatives of simple modular forms. The procedure reproduces the Seiberg-Witten results for N_f=0,2,3 in a uniform way, but indicates open problems for N_f=1.
4 pages, plain TeX