Timeline for A reference for $\mathbb{A}^1_R$ being a coarse moduli space of the stack of elliptic curves
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
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| Mar 6, 2015 at 17:57 | comment | added | Lennart Meier | @Tyler and Question Mark: Thanks for the suggestion and for the correction. I have incorporated both into the answer. | |
| Mar 6, 2015 at 17:56 | history | edited | Lennart Meier | CC BY-SA 3.0 |
added 1172 characters in body
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| Mar 4, 2015 at 21:36 | comment | added | Question Mark | I don't understand the "everything else is flat over these" part. E.g., $\mathbb{Z}/p^2\mathbb{Z}$ is not flat over a $\mathbb{Z}$ and it is not a ring over $\mathbb{F}_p$. | |
| Mar 4, 2015 at 21:26 | comment | added | Tyler Lawson | I believe that Claim 3 boils down to the computation that $H^1({\cal M}_1, {\cal O})$ is flat (it actually vanishes) -- this isn't formal, and it fails for the moduli of {elliptic curves + nowhere-vanishing 1-forms}, where base-change is false. | |
| Mar 4, 2015 at 20:20 | history | answered | Lennart Meier | CC BY-SA 3.0 |