tonight's enigma: q-series identity in http://arxiv.org/abs/1408.1597 q=e^(2πi τ) Im(τ)>0 τ-> (aτ+b)/(cτ+d) SL(2,Z) meaning in paper's context?
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tonight's enigma: q-series identity in http://arxiv.org/abs/1408.1597 q=e^(2πi τ) Im(τ)>0 τ-> (aτ+b)/(cτ+d) SL(2,Z) meaning in paper's context?