Timeline for Embedding 2-complexes null homotopically into 2-complexes
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Mar 31, 2020 at 14:11 | comment | added | HJRW | I'm not certain that this question is any easier than the Whitehead conjecture itself! | |
| Mar 27, 2020 at 4:23 | history | edited | user101010 | CC BY-SA 4.0 |
added 213 characters in body
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| Mar 27, 2020 at 2:43 | comment | added | mme | For the final question: if $A \subset B$ is an inclusion of 2-complexes, then $H_2(A)$ injects into $H_2(B)$ (as $H_3(A,B) = 0$ for dimensions reasons). So for instance $S^2$ can't be null as a subcomplex of any 2-complex. | |
| Mar 27, 2020 at 2:03 | history | asked | user101010 | CC BY-SA 4.0 |