-2
I have the following expression:
$$ h(\tau) = \Bigg [ \frac{|\eta|}{1 + |\eta|^2} \Bigg ]^{4J} \sum_{m, p = -1}^{1} |\eta|^{2(m + p)} \binom{2J}{J + m} \binom{2J}{J + p} e^{- i \triangle(\tau)(m^2 - p^2)} e^{\gamma(\tau)(m - p)^2} $$,
where $\eta = e^{i \phi} \tan \Big (\frac{\theta}{2} \...
