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Multiplicative -quotients
Authors:Yves Martin
Institution:Department of Mathematics, University of California, Berkeley, California 94720
Abstract:Let $ \eta (z) $ be the Dedekind $ \eta $-function. In this work we exhibit all modular forms of integral weight $ f(z) = \eta (t_1z)^{r_1}\eta (t_2z)^{r_2}\dots \eta(t_sz)^{r_s} $, for positive integers $ s $ and $ t_j $ and arbitrary integers $ r_j $, such that both $ f(z) $ and its image under the Fricke involution are eigenforms of all Hecke operators. We also relate most of these modular forms with the Conway group $ 2 % \mathrm {Co}_1 $ via a generalized McKay-Thompson series.

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