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A new look at Hecke's indefinite theta series

Alexander Polishchuk
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Abstract

We describe a family of $q$-series generating the space of weight 1 modular forms coming from indefinite binary quadratic forms and study linear relations between these series.

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Alexander Polishchuk. 2001-02-13. A new look at Hecke's indefinite theta series. https://arxiv.org/abs/math/0012005

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