Timeline for A counter example in obstruction theory
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Apr 4, 2012 at 13:22 | vote | accept | KotelKanim | ||
| Apr 4, 2012 at 13:22 | comment | added | KotelKanim | Oops... that was silly. Thanks for the answer. | |
| Apr 4, 2012 at 13:20 | history | edited | Neil Strickland | CC BY-SA 3.0 |
Argument spelled out in more detail.
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| Apr 4, 2012 at 13:05 | comment | added | Neil Strickland | Cohomology is contravariant. | |
| Apr 4, 2012 at 12:52 | comment | added | KotelKanim | I don't see how the last line gives a contradiction. You have a non-zero element in $H^3(K)$, which is mapped to zero in $H^3(Y)$, what's wrong with that? | |
| Apr 4, 2012 at 12:14 | history | answered | Neil Strickland | CC BY-SA 3.0 |