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Minimizing Euler characteristics of symplectic four-manifolds

D. Kotschick

math.GTarXiv:math/0504578

Abstract

We prove that the minimal Euler characteristic of a closed symplectic four-manifold with given fundamental group is often much larger than the minimal Euler characteristic of almost complex closed four-manifolds with the same fundamental group. In fact, the difference between the two is arbitrarily large for certain groups.

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