By Clark G. L., Duane W.

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**Example text**

In view of the following lemma, A0 and B 0 provide an example of A and B respectively as above. J / we mean the ring of endomorphisms of J defined over Q. 1. J / preserves A0 and B 0 . Proof. J / does not preserve A0 (the case of B 0 is symmetric). Then since the Jf ’s are simple, that means that some abelian subvariety Jg of A0 is isogenous to some abelian subvariety Jh of B 0 , where g ¤ h. Pick a prime `. If f is a newform, then let f denote the canonical absolutely irreducible `-adic representation attached to f .

Stein Key words elliptic curves • abelian varieties • modular degree • congruence primes • multiplicity one Mathematics Subject Classification (2010): 11G05, 11610, 11G18, 11F33 1 Introduction Let E be an elliptic curve over Q. N /, where N is the conductor of E. N / ! N / (this can always be done by replacing E by an isogenous curve if needed). N / ! N / ! N /. N /; C/ be the newform attached to E. mod rE / for all n). Section 2 is about relations between rE and mE . For example, mE j rE . In [FM99, Q.

EndT M . Suppose m is a maximal ideal of T that satisfies the hypotheses of the lemma. To prove that Tm D T0m it suffices to prove the following claim: t u Claim: The map jT is surjective locally at m. Proof. It suffices to show that M is generated by a single element over T locally at m, and in turn, by Nakayama’s lemma, it suffices to check that the dimension of the T=m -vector space M=mM is at most one. N /=Fp /Œm. M=mM / Ä 1, which proves the claim. 12. , see [Dia97]). 8, all we needed was (locally) a non-zero free T-module (of finite rank, say) that is attached functorially to J .