Abstract
We prove that the product of two nearly holomorphic Hecke eigenforms is again a Hecke eigenform for only finitely many choices of factors.
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Beyerl, J., James, K., Trentacoste, C. et al. Products of nearly holomorphic eigenforms. Ramanujan J 27, 377–386 (2012). https://doi.org/10.1007/s11139-011-9321-2
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DOI: https://doi.org/10.1007/s11139-011-9321-2