


The SeibergWitten Equations and Applications to the Topology of Smooth FourManifolds. (MN44) 
The recent introduction of the SeibergWitten invariants of smooth fourmanifolds has revolutionized the study of those manifolds. The invariants are gaugetheoretic in nature and are close cousins of the muchstudied SU(2)invariants defined over fifteen years ago by Donaldson. On a practical level, the new invariants have proved to be more powerful and have led to a vast generalization of earlier results. This book is an introduction to the SeibergWitten invariants. The work begins with a review of the classical material on Spin c structures and their associated Dirac operators. Next comes a discussion of the SeibergWitten equations, which is set in the context of nonlinear elliptic operators on an appropriate infinite dimensional space of configurations. It is demonstrated that the space of solutions to these equations, called the SeibergWitten moduli space, is finite dimensional, and its dimension is then computed. In contrast to the SU(2)case, the SeibergWitten moduli spaces are shown to be compact. The SeibergWitten invariant is then essentially the homology class in the space of configurations represented by the SeibergWitten moduli space. The last chapter gives a flavor for the applications of these new invariants by computing the invariants for most Kahler surfaces and then deriving some basic toological consequences for these surfaces. "This book provides an excellent introduction to the recently discovered SeilbergWitten invariants for smooth closed oriented 4mainifolds."Mathematical Reviews
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