most citedHecke Eigenforms as Products of Eigenforms

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math.NT2011★ 2 cited

Hecke Eigenforms as Products of Eigenforms

Matthew L. Johnson

We investigate when the product of two Hecke eigenforms for Γ_1(N) is again a Hecke eigenform. In this paper we prove that the product of two normalized eigenforms for Γ_1(N), of w…