Timeline for For $G$ an adjoint Chevalley group, are all of $G(\mathbb Z)$'s finite-index subgroups congruence subgroups?
Current License: CC BY-SA 4.0
9 events
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| Jul 15, 2019 at 18:56 | comment | added | Jim Humphreys | Venkataramana has given a concise answer known for a long time (with a reference to Serre) to the question raised in the header, though I've tried to answer another question raised about sources in English. | |
| Jul 14, 2019 at 0:30 | vote | accept | Ami | ||
| Jul 13, 2019 at 18:55 | vote | accept | Ami | ||
| Jul 13, 2019 at 18:55 | |||||
| Jul 11, 2019 at 21:07 | answer | added | Jim Humphreys | timeline score: 7 | |
| Jul 11, 2019 at 9:14 | history | edited | YCor | CC BY-SA 4.0 |
formatting; edited tags
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| Jul 11, 2019 at 0:55 | comment | added | Venkataramana | I forgot to mention that this is also in French, but the expository paper is very easy to read (and there is google translate) | |
| Jul 11, 2019 at 0:38 | comment | added | Venkataramana | You are asking if a Chevally group of adjoint type has the congruence subgroup property. The answer is no, unless the Chevalley group is simply connected. The precise reference is Serre's article in Seminaire Bourbaki (volume 10) numdam.org/book-part/SB_1966-1968__10__275_0. See section 1.2 part c) of that paper. | |
| Jul 11, 2019 at 0:23 | history | edited | LSpice | CC BY-SA 4.0 |
Name of paper
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| Jul 10, 2019 at 23:34 | history | asked | Ami | CC BY-SA 4.0 |