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Tagged with half-integral-weight quadratic-forms
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Does there exist a half-integer weight theta function which is is equivalent to 1 modulo 4?
Given a quadratic form $F$ in $n$ variables, there is an associated theta function $\theta_F(z) = \sum_{m \in \mathbb{Z}} q^{F(m)}$, which is a modular form of weight $n/2$. Letting $F(m) = m^2$ ...
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