Timeline for Closed 3-manifolds with free abelian fundamental groups
Current License: CC BY-SA 2.5
4 events
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| Jul 14, 2010 at 21:33 | history | edited | Mariano Suárez-Álvarez | CC BY-SA 2.5 |
added 55 characters in body; added 1 characters in body
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| Jul 14, 2010 at 21:33 | comment | added | Jason DeVito - on hiatus | @EL The statement is not that these occur as fundamental groups of a closed 3-manifold, but that they occur as subgroups of the fundamental group of a closed 3-manifold. The group $Z^2$ is a subgroup of $Z^3 = \pi_1(T^3)$. | |
| Jul 14, 2010 at 21:29 | comment | added | user7621 | I can't find that statement in Hempel, but in any case something must be wrong since Dmitri and Lennart gave nice proofs that Z^2 can't occur. | |
| Jul 14, 2010 at 21:21 | history | answered | Mariano Suárez-Álvarez | CC BY-SA 2.5 |