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