Holomorphic projections and Ramanujan's mock theta functions.

Imamoğlu, Özlem; Raum, Martin; Richter, Olav K · Proc Natl Acad Sci U S A · 2014

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Abstract

We use spectral methods of automorphic forms to establish a holomorphic projection operator for tensor products of vector-valued harmonic weak Maass forms and vector-valued modular forms. We apply this operator to discover simple recursions for Fourier series coefficients of Ramanujan's mock theta functions.

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