Hi, im trying to prove that $\displaystyle \sum_{k=1}^\infty\text{cosech}(kx)$ u.c. for $\displaystyle |x|\geq\delta>0$. I have a solution, but I don't understand it at all.
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Sorry, already solved: $\displaystyle |\text{cosech}(nx)|\leq|\text{cosech}(n\delta)|\le q \frac{12}{n^3\delta^3}=M_n$ (Taylor for $\displaystyle e^{n\delta}$)
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