Timeline for Relationship between $H_*(X, A)$ and $H_*(Y \cup_f X, Y)$? $\pi_*(X, A)$ and $\pi_*(Y \cup_f X, Y)$?
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 1, 2015 at 17:04 | answer | added | Ronnie Brown | timeline score: 1 | |
| Sep 1, 2015 at 15:10 | vote | accept | User | ||
| Sep 1, 2015 at 15:06 | comment | added | Fernando Muro | Start with the wedge of a circle and a sphere and then fill in the disk. | |
| Sep 1, 2015 at 14:51 | answer | added | Achim Krause | timeline score: 5 | |
| Sep 1, 2015 at 14:34 | comment | added | User | Could I have a counterexample to isomorphism in the case for homotopy? | |
| Sep 1, 2015 at 14:24 | comment | added | Achim Krause | For homology, they're isomorphic. For homotopy, they're isomorphic through a range depending on the connectivity of these spaces. For details, look for the word "excision" in any standard algebraic topology textbook, e.g. Hatcher. | |
| Sep 1, 2015 at 14:16 | review | Close votes | |||
| Sep 3, 2015 at 6:22 | |||||
| Sep 1, 2015 at 13:56 | review | First posts | |||
| Sep 1, 2015 at 14:20 | |||||
| Sep 1, 2015 at 13:52 | history | asked | User | CC BY-SA 3.0 |