Timeline for Is every additive cohomology operation stable?
Current License: CC BY-SA 4.0
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| Apr 12, 2021 at 3:36 | comment | added | Tyler Lawson | I think the issue is with homotopies. Eg the standard simplicial model for BG has the properties that you describe. But a homotopy is allowed to be nontrivial on a 1-simplex $p \times \Delta^1$ so long as p is not the basepoint. | |
| Apr 12, 2021 at 0:30 | comment | added | Tim Campion | Er -- the same proof would seem to show that $f$ is a map of simplicial abelian groups, assuming that $A$ is a simplicial abelian group, which is false. Probably there is something up with the claim that that diagram commutes... | |
| Apr 12, 2021 at 0:21 | history | edited | Tim Campion | CC BY-SA 4.0 |
added 15 characters in body
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| Apr 12, 2021 at 0:12 | history | answered | Tim Campion | CC BY-SA 4.0 |