Top network posts

• 143 Does a "cubic" matrix exist?
• 54 Is there any geometric way to characterize $e$?
• 30 Why does the series $\sum_{n=1}^\infty\frac1n$ not converge?
• 21 Mystery about $\sum_{n\geqslant 1}2^{-n!}$
• 20 Rigorous proof that $\frac{1}{3} = 0.333\ldots$
• 20 Is $\sqrt[3]{p+q\sqrt{3}}+\sqrt[3]{p-q\sqrt{3}}=n$, $(p,q,n)\in\mathbb{N} ^3$ solvable?
• 17 Evaluating $\sum_{k=1}^{\infty}\frac{\sin\left(k\theta\right)}{k^{2u+1}}$ with multiple integrals
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