Top network posts

• 83 How can I evaluate $\sum_{n=0}^\infty(n+1)x^n$?
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• 23 Units of a log of a physical quantity
• 21 Proving $\left(\sum_{n=-\infty}^\infty q^{n^2} \right)^2 = \sum_{n=-\infty}^\infty \frac{1}{\cos(n \pi \tau)}$
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