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• 224 Different methods to compute $\sum\limits_{k=1}^\infty \frac{1}{k^2}$ (Basel problem)
• 69 What is the Jacobian matrix?
• 65 Nice proofs of $\zeta(4) = \frac{\pi^4}{90}$?
• 59 What is the importance of Calculus in today's Mathematics?
• 51 What is the result of $\infty - \infty$?
• 47 Is $\sqrt[3]{p+q\sqrt{3}}+\sqrt[3]{p-q\sqrt{3}}=n$, $(p,q,n)\in\mathbb{N} ^3$ solvable?
• 42 What does closed form solution usually mean?
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