Timeline for HNN extensions which are free products
Current License: CC BY-SA 2.5
3 events
| when toggle format | what | by | license | comment | |
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| Dec 11, 2009 at 5:02 | comment | added | HJRW | Another way of seeing this is to look at $\pi_2$. A non-trivial free product has an essential 2-sphere, whereas it's easy to see that the universal cover of a torus bundle is homeomorphic to $\mathbb{R}^3$. | |
| Dec 11, 2009 at 2:16 | history | edited | janmarqz | CC BY-SA 2.5 |
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| Dec 11, 2009 at 2:07 | history | answered | janmarqz | CC BY-SA 2.5 |