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 Mar 16 awarded Guru Oct 10 awarded Good Answer Jun 2 awarded Yearling Mar 2 reviewed Approve Prove that there is an increasing sequence $\{a_n\}$ of points in $A$ such that $\lim a_n = \sup A$. Mar 1 comment Evaluate $\sum_{n=1}^\infty (-1)^n/(n^4)$ This has been asked here: math.stackexchange.com/questions/1169861/… Mar 1 reviewed Approve Complex Number Maths Mar 1 answered Properties of resolvent operators Feb 26 reviewed Approve Formal proof of a very simple fact. Feb 24 revised Multiplication of absolutely continuous function and function of bounded variation Added Tex. Feb 24 reviewed Approve Is $f(x)=\frac{\cos \left(x\right)}{1+x^2}$ uniformly continuous? Feb 23 reviewed Approve Power series divergence (real analysis) Feb 23 reviewed No Action Needed Calculus problem about equality of series and integral Feb 19 reviewed Approve exotic smooth structures Feb 19 awarded Custodian Feb 19 reviewed Looks OK What is the limit of $\lim_{x\to -\infty}\frac{\sqrt{x^2}}{x}$? Feb 19 reviewed Approve Let $x = (11, 2)^T$ . Find both reflection matrices $M$ such that $Mx$ is a multiple of $e_1$. Feb 17 awarded Custodian Feb 17 reviewed Approve Analysis question about density of rationals Feb 16 comment converge absolutely/conditionally : (cos(npi)) / ((n+1)ln(n+1))? You're welcome! Feb 16 comment converge absolutely/conditionally : (cos(npi)) / ((n+1)ln(n+1))? Try $u=\ln(x+1)$.