Timeline for Frobenius endomorphism is not flat
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 6, 2021 at 8:32 | history | edited | YCor | CC BY-SA 4.0 |
formatting
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| Dec 6, 2021 at 7:50 | history | edited | Matthieu Romagny | CC BY-SA 4.0 |
typos
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| Dec 6, 2021 at 7:49 | comment | added | Matthieu Romagny | Have you tried $R=k[x]/(x^2)$? | |
| Dec 6, 2021 at 7:25 | comment | added | Piotr Achinger | If $R$ has no nilpotent elements, then $\varphi$ is injective, and hence it is flat if and only if $R$ is flat over $\varphi(R)$. | |
| Dec 6, 2021 at 7:00 | history | asked | dongrugose | CC BY-SA 4.0 |