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Ivancevic_Applied-Diff-Geom

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<strong>Applied</strong> Bundle <strong>Geom</strong>etry 785Although generally there is a lot of solutions to the matrix equations(4.290), it is extremely non–trivial task to express all the matrix elementsthrough the only function F. In fact, there have been only known the twodifferent classes of the non–trivial solutions to the WDVV equations, bothbeing intimately related to the 2D topological theories of type A (quantumcohomologies) and of type B (N = 2 SUSY Landau-Ginzburg (LG)theories). Thus, the existence of a new class of solutions connected withthe 4D theories looks quite striking. It is worth noting that both the 2Dtopological theories and the SW theories reveal the integrability structuresrelated to the WDVV equations.This system of nonlinear equations is satisfied by the SW prepotentialdefining the low-energy effective action. Moreover the leading perturbativeapproximation to this exact SW prepotential should satisfy this set ofequations by itself. For instance, for the gauge group SU(n) the expression[Mironov (1998)]F pert = 1 4∑i≤i

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