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• 240 Different methods to compute $\sum\limits_{k=1}^\infty \frac{1}{k^2}$ (Basel problem)
• 74 What is the Jacobian matrix?
• 65 Nice proofs of $\zeta(4) = \frac{\pi^4}{90}$?
• 60 What is the importance of Calculus in today's Mathematics?
• 52 What is the result of $\infty - \infty$?
• 49 Is $\sqrt[3]{p+q\sqrt{3}}+\sqrt[3]{p-q\sqrt{3}}=n$, $(p,q,n)\in\mathbb{N} ^3$ solvable?
• 43 Proving $\int_{0}^{\infty} \mathrm{e}^{-x^2} dx = \frac{\sqrt \pi}{2}$
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