Relations among modular points on elliptic curves

Details Relations among modular points on elliptic curves Relations among modular points on elliptic curves

2007-06-05

arxiv.org/abs/0706.0566v1

Mathematics

Number Theory

48 pages

Scientific paper

Given a correspondence between a modular curve and an elliptic curve A we study the group of relations among the CM points of A. In particular we prove that the intersection of any finite rank subgroup of A with the set of CM points of A is finite. We also prove a local version of this global result with an effective bound valid also for certain infinite rank subgroups. We deduce the local result from a ``reciprocity'' theorem for CL (canonical lift) points on A. Furthermore we prove similar global and local results for intersections between subgroups of A and isogeny classes in A. Finally we prove Shimura curve analogues and, in some cases, higher-dimensional versions of these results.

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