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A new method for analyzing supersymmetric gauge theories is presented. This method relies on the counting of all the chiral operators in the chiral ring of a supersymmetric gauge theory. The counting is done by computing a generating function which counts all possible BPS operators that carry a specified set of global U(1) charges. Remarkably, if the supersymmetric gauge theory lives on N D3 brane in Type IIB string theory, exact results for any number of D3 branes can be written down in a concise and elegant fashion. The paper summarizes results from published work in 1,2,3.
Hanany et al. (Mon,) studied this question.