Control maths test

\sum_{k = 1}^{\infty} \frac{q_{}^{k_{}^{2} + k}}{(1 - q) (1 - q_{}^{2}) \dots (1 - q_{}^{k})} \frac{q_{}^{2}}{(1 - q)} + \frac{q_{}^{6}}{(1 - q) (1 - q_{}^{2})} + \dots

{\hat{Ell}}_{Y} (Z; z, τ) := \sum_{Y} (\prod_{l} \frac{(\frac{y_{l}}{2 π i}) θ (\frac{y_{l}}{2 π i} - z) θ^{'} (0)}{θ (- z) θ (\frac{y_{l}}{2 π i})}) \times (\prod_{k} \frac{θ (\frac{e_{k}}{2 π i} - (α_{k} + 1) z) θ (- z)}{θ (\frac{e_{k}}{2 π i} - z) θ (- (α_{k} + 1) z)})

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