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when toggle format what by license comment
Apr 18, 2012 at 21:01 answer added Lee Mosher timeline score: 2
Apr 18, 2012 at 17:19 comment added Ian Agol You may be referring to the congruence subgroup problem: front.math.ucdavis.edu/0901.4663
Apr 18, 2012 at 16:32 history asked berl13 CC BY-SA 3.0