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 18h accepted How to generate complicated looking identities such as $\sqrt [3] {2 + \sqrt 5} - \sqrt [3] {2 - \sqrt 5}=1$ easily? Jan14 accepted How often is $1+\prod_{k=1}^n p_k$ not prime? Dec31 accepted What are solutions to $2^x=x$? Dec20 accepted Why $\int_0^{\infty} du \, \frac{e^{-3 u} - e^{-4 u}}{u} = \int_0^{\infty} du \, \int_3^4 dt \, e^{-u t} \\$? Oct8 accepted Limit $\lim_{x\to\infty} \frac {a_nx^n+a_{n-1}x^{n-1}+\cdots+a_0}{{b_nx^n+b_{n-1}x^{n-1}+\cdots+b_0}}$ Sep22 accepted $\lim_{x\to\infty}\sqrt [n] {p_n(x)}-\sqrt [m] {p_m(x})$ where $p_k(x)$ is polynomial of order k. Mar19 accepted Largest possible 2D combination not containing 2 common rectangles Mar17 accepted For which $\alpha$ does the series $\sum_{n = 1}^{\infty}\big(2^{n^{-\alpha}}\!\! - \!1\big)$ converge? Dec3 accepted Is $f(x)>g(x) \iff \frac {\operatorname d}{\operatorname d x }f(x)>\frac {\operatorname d}{\operatorname d x }g(x)$? Nov17 accepted What's the deal with integration? Nov12 accepted which one is larger $\sqrt[n]{x+\delta}-\sqrt[n]{x}$ or $\sqrt[n]{x}-\sqrt[n]{x-\delta}$? Sep30 accepted Sum $\sum_{k=1}^{n}a^k\sin(k \frac{2\pi}{l})$ Jul31 accepted Are $\pi$ and $e$ algebraically independent? Jul27 accepted if terms of an alternating series approach 0 then that alternating series converges. Jun6 accepted $\sqrt 2$ is even? May21 accepted Why substitution method does not work for $\int (x-\frac{1}{2x} )^2\, \mathrm dx$? May17 accepted Strong characterization of $\mathbb C$ with respect to $\mathbb R$ May12 accepted $2^n-3^m=1 , m,n \in \mathbb N =?$ May9 accepted $\log_{2}{3} > \log_{3}{5}$? Feb26 accepted Super or subscript notation on the left hand side of a symbol?