Timeline for Any 3-manifold can be realized as the boundary of a 4-manifold
Current License: CC BY-SA 4.0
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| Jul 22, 2018 at 1:36 | comment | added | Igor Rivin | @wonderich The results I allude to talk about when two manifolds are cobordant, whereas you are asking about when ONE manifold bounds. Bounds, means it and the sphere (or the empty set, which is a debatable manifold) co-bound. | |
| Jul 22, 2018 at 0:10 | comment | added | wonderich | thanks +1, you mean the second manifold of what? | |
| Jul 21, 2018 at 17:02 | history | answered | Igor Rivin | CC BY-SA 4.0 |