Timeline for Remove a disc from a manifold. When is the resulting sphere nullhomotopic?
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Oct 2, 2017 at 18:35 | vote | accept | Michael Albanese | ||
| Oct 2, 2017 at 14:16 | comment | added | Oscar Randal-Williams | Yes, that is what I meant on both counts. | |
| Oct 2, 2017 at 11:28 | comment | added | Michael Albanese | Thanks for your answer. I really should have thought to do this. Just a couple of questions about notation. Is $\pi D^{\circ}$ the image of an open disc in $\widetilde{M}$ under the action of the deck transformations (equivalently, the preimage of $D^{\circ}$ under the covering map)? Also, does $\bigvee^{\pi}S^n$ just denote a wedge of $|\pi|$ spheres? I would normally expect to see $\pi$ as a subscript rather than the superscript, that's why I ask. | |
| Sep 29, 2017 at 20:46 | history | answered | Oscar Randal-Williams | CC BY-SA 3.0 |