Timeline for Elegant proof that any closed, oriented 3-manifold is the boundary of some oriented 4-manifold?
Current License: CC BY-SA 3.0
3 events
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| Apr 30, 2011 at 9:26 | comment | added | Bruno Martelli | Nice induction proof. You can think of 3 handlebodies attached to the same surface $S$: if two pairs of them bound 4-manifolds $M_1, M_2$, then also the third pair does (the union of $M_1$ and $M_2$ along the third handlebody). | |
| Apr 29, 2011 at 21:23 | history | edited | Daniel Moskovich | CC BY-SA 3.0 |
added 1924 characters in body; added 8 characters in body; added 2 characters in body; deleted 4 characters in body
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| Apr 29, 2011 at 3:33 | history | answered | Daniel Moskovich | CC BY-SA 3.0 |