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Siméon
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37
Collection of surprising identities and equations.
33
How quickly can the derivative of an everywhere differentiable function change sign?
17
Probability that $n$ is coprime to both $m$ and $m+1$
16
Evaluate $\lim\limits_{n \to\infty} \left(\frac{n-1} {2n+2}\right)^n$
13
True/False: $\mathop {\lim }\limits_{n \to \infty } {{{a_n}} \over {{b_n}}} = 1$ implies $\sum {{a_n},\sum {{b_n}} } $ converge or diverge together.