Timeline for The coproduct on the cohomology of a Hopf algebra
Current License: CC BY-SA 3.0
5 events
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| Feb 13, 2012 at 10:03 | history | edited | Ralph | CC BY-SA 3.0 |
Clarified a detail.
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| Feb 13, 2012 at 10:02 | comment | added | Ralph | Yes, thanks. In more detail: A hom. of $k$-algebras $A \to B$ induces a $k$-linear map $Ext_B \to Ext_A$. That is what is used in the last part. | |
| Feb 13, 2012 at 2:41 | comment | added | Theo Johnson-Freyd | Well, I would not call $\Delta$ a "Hopf algebra homomorphism" unless it is cocommutative. Certainly it is an algebra homomorphism, which is I think what you mean. | |
| Feb 13, 2012 at 1:17 | history | edited | Ralph | CC BY-SA 3.0 |
Simplified an argument.
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| Feb 13, 2012 at 0:13 | history | answered | Ralph | CC BY-SA 3.0 |