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.
The 4-manifolds tag is for questions concerning 4-dimensional manifolds: smooth, PL or topological, or with any additional structure. See the Wikipedia page for a coarse summary of the area.
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13 years, 3 months ago by Andrew Ranicki |
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7 years, 7 months ago |
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