most recent 30 from http://mathoverflow.net 2013-05-23T19:21:05Z http://mathoverflow.net/feeds/question/65271 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/65271/torsion-points-under-sl-2z-nz Math11 2011-05-17T20:15:51Z 2011-05-17T20:15:51Z

<p>Taking T \in E[p] and looking at the right action of SL_2(Z/pZ) on T for prime p, one can easily see that you obtain again all points in E[p] equally many times. Now what would happen when we take T \in E[n], which points do I get equally many times by the same action and which points will be taken to zero. </p>