Timeline for Some special subgroups of formal groups
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| Mar 23, 2021 at 18:34 | answer | added | Neil Strickland | timeline score: 2 | |
| Oct 22, 2020 at 18:08 | vote | accept | kiran | ||
| Sep 23, 2020 at 2:56 | answer | added | Lubin | timeline score: 2 | |
| Sep 22, 2020 at 22:54 | comment | added | kiran | @Lubin So $u\cdot f$ "is" $T$ - it is not quite an endomorphism of $F$ but rather sends $F$ to $\phi^*F$. And instead of $G/\text{ker}T\cong G$ all I have is $G/\text{ker} T\hookrightarrow \phi^*G$. | |
| Sep 22, 2020 at 17:47 | comment | added | Lubin | Your description of specialness in the Edit seems to be demanding that there would be an endomorphism $u\cdot f$ of $F$, vanishing on the kernel of $T$, so that in some sense $G/(\ker T)\cong G$ as formal groups. Have I misconstrued? | |
| Sep 22, 2020 at 7:54 | history | edited | YCor | CC BY-SA 4.0 |
removed capitals from title
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| Sep 22, 2020 at 7:48 | history | edited | kiran | CC BY-SA 4.0 |
added 406 characters in body
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| Sep 22, 2020 at 7:26 | comment | added | kiran | @QiaochuYuan It's a closed formal subscheme that's finite and free and is also a group. That's equivalent to the data of a monic polynomial $f(x)$ with nilpotent lower order coefficients such that $f(F(x,y))=0$ mod $(f(x),f(y))$. | |
| Sep 22, 2020 at 5:35 | comment | added | Qiaochu Yuan | What's a finite subgroup of a formal group? | |
| Sep 22, 2020 at 3:21 | review | First posts | |||
| Sep 22, 2020 at 5:11 | |||||
| Sep 22, 2020 at 3:18 | history | asked | kiran | CC BY-SA 4.0 |