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Oct 30, 2013 at 16:10 vote accept IMeasy
Oct 28, 2013 at 10:51 comment added IMeasy right, strictly bigger than 3.
Oct 28, 2013 at 10:31 comment added stankewicz Actually, $r\ge 4$
Oct 28, 2013 at 7:25 comment added IMeasy thanks, I will read. I guess that if $r\geq 3 $ then the modular curve is already rigid right? I only see the $\pm Id$ automorphism, when $r=2$.
Oct 28, 2013 at 6:57 history edited Dan Petersen CC BY-SA 3.0
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Oct 28, 2013 at 6:51 history answered Dan Petersen CC BY-SA 3.0