Timeline for Are there noncongruence subgroups (of finite index) of the modular group generated only by 2 or 3 elements?
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
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| Jan 10, 2013 at 4:26 | vote | accept | Will Chen | ||
| Jan 10, 2013 at 1:20 | comment | added | Ian Agol | Yes, good point. I had in mind showing the preimage is rank 3, but it doesn't matter. | |
| Jan 10, 2013 at 0:16 | comment | added | Will Sawin | Can't you just lift the three generators arbitrarily, and produce a noncongruence subgroup of rank 3 of index either 7 or 14? | |
| Jan 9, 2013 at 23:48 | history | answered | Ian Agol | CC BY-SA 3.0 |