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 2020-02-24, 20:40 #7 wildrabbitt   Jul 2014 3·149 Posts Thanks. Are you substituting $$e^{-u}$$ for $$x$$ ? What are you doin with $$u$$? Also, in case there's an obvious remedy to my latex not parsing properly, here's an example of what I wrote in the first post without the \$$and \$$. \sum_{n=1}^\infty \big(\frac{n}{q}\big)x^n=\frac{1}{1-x^q}\sum_{m=1}^{q-1}\big(\frac{m}{q}\big)x^m=\frac{xf(x)}{1-x^q} Last fiddled with by wildrabbitt on 2020-02-24 at 20:44 Reason: needed to access page source