Timeline for What are the cohomology groups $H^d(BSO_\infty,Z)$ and $H^d(BO_\infty,Z)$?
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
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| Apr 5, 2019 at 7:17 | comment | added | user43326 | @DavidRoberts thank you for the comment and edit. Actually it was both $H^3$ and $H^5$, I corrected. | |
| Apr 5, 2019 at 7:16 | history | edited | user43326 | CC BY-SA 4.0 |
Corrected $H^3$ missing for $BSO$ case, and removed overlap in $BO$ case.
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| Apr 5, 2019 at 1:58 | vote | accept | Xiao-Gang Wen | ||
| Apr 1, 2019 at 13:15 | comment | added | David Roberts♦ | I do wonder if that $H^5$ in the first block, which originally came before the $H^4$ (I re-ordered them in ascending dimension) was meant to be an $H^3$...? | |
| Apr 1, 2019 at 11:44 | history | edited | David Roberts♦ | CC BY-SA 4.0 |
Clean-up
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| May 9, 2014 at 16:23 | history | edited | user43326 | CC BY-SA 3.0 |
added missed elements pointed out in a comment
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| May 8, 2014 at 9:29 | comment | added | user43326 | You are right, we have $\delta (w_4)$ in $H^5(BSO)$ and $H^5(BO)$, as well as $\delta (w_1)^2$ in $H^4(BO)$. I will edit the answer | |
| May 8, 2014 at 1:16 | comment | added | Xiao-Gang Wen | Thank you for the answer. I am not familiar with those polynomial rings. But I wonder do you also have $\delta(w_4)$ term for the $BSO$ and $BO$ cases, and the $\delta(w_1)\delta(w_1)$ for the $BO$ case? May be there are few more $Z/2$'s. | |
| May 7, 2014 at 8:12 | history | answered | user43326 | CC BY-SA 3.0 |