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Microscopic tests of the exact results are performed in N = 2 SU(2) supersymmetric QCD. We construct the multi-instanton solution in N = 2 supersymmetric QCD and calculate the two-instanton contribution F 2 to the prepotential F explicitly. For N f = 1,2, instanton calculus agrees with the prediction of the exact results, however, forN f = 3, we find a discrepancy between...
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