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
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| when toggle format | what | by | license | comment | |
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| Jan 11, 2013 at 10:00 | comment | added | François Brunault | I checked in Wohlfahrt and yes, amplitude is the same as width. | |
| Jan 10, 2013 at 17:58 | comment | added | Lee Mosher | Assuming your "width" means Wohlfart's "amplitude" in my answer, neither one of these is Wohlfart's example, which would be $\Gamma_{6,1}$ in your notation. I checked and can verify that these are the other two index 7 examples isomorphic to $\mathbb{Z} * \mathbb{Z}/3 * \mathbb{Z}/2$ that I allude to in my answer. | |
| Jan 10, 2013 at 8:30 | history | answered | François Brunault | CC BY-SA 3.0 |