Mathematics – Number Theory
Scientific paper
2007-10-03
Automorphic Forms and L-functions I; Global Aspects, Proceedings in honor of Steve Gelbart on the occasion of his sixtieth bir
Mathematics
Number Theory
A sentence has been modified in the Introduction. It has nothing to do with the main result of the paper
Scientific paper
In this paper we prove the following conditional result: Let F be a number field, and pi a cusp form on GL(2)/F which is not solvable polyhedral. Assume that all the symmetric powers sym^m(pi) are modular, i.e., define automorphic forms on GL(m+1)/F. If sym^6(pi) is cuspidal, then all the symmetric powers are cuspidal, for all m. Moreover, sym^6(pi) is Eisenteinian iff sym^5(pi) is an abelian twist of the functorial product of pi with the symmetric square of a cusp form pi' on GL(2)/F.
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