Source: wikibot/intersection-form-of-a-4-manifold
= Intersection form of a 4-manifold
{wiki=Intersection_form_of_a_4-manifold}
In differential topology, the intersection form of a 4-manifold is an important algebraic invariant that captures information about how surfaces intersect within the manifold. Specifically, consider a smooth, closed, oriented 4-manifold \\( M \\). The intersection form is defined using the homology of \\( M \\).