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#4-manifold

4-manifold

Mathematical space

In mathematics, a 4-manifold is a 4-dimensional topological manifold. A smooth 4-manifold is a 4-manifold with a smooth structure. In dimension four, in marked contrast with lower dimensions, topological and smooth manifolds are quite different. There exist some topological 4-manifolds which admit no smooth structure, and even if there exists a smooth structure, it need not be unique.

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4-manifold Manifold List of manifolds Differentiable manifold Hyperkähler manifold Intersection form of a 4-manifold Classification of manifolds Stein manifold Pseudo-Riemannian manifold Low-dimensional topology

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