Intersection form of a 4-manifold
A special symmetric bilinear form on the 2nd (co)homology group of a 4-manifold / From Wikipedia, the free encyclopedia
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In mathematics, the intersection form of an oriented compact 4-manifold is a special symmetric bilinear form on the 2nd (co)homology group of the 4-manifold. It reflects much of the topology of the 4-manifolds, including information on the existence of a smooth structure.