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# 190 Actions

 Mar2 reviewed Approve Prove that there is an increasing sequence $\{a_n\}$ of points in $A$ such that $\lim a_n = \sup A$. Mar1 comment Evaluate $\sum_{n=1}^\infty (-1)^n/(n^4)$ This has been asked here: math.stackexchange.com/questions/1169861/… Mar1 reviewed Approve Complex Number Maths Mar1 answered Properties of resolvent operators Feb26 reviewed Approve Formal proof of a very simple fact. Feb24 revised Multiplication of absolutely continuous function and function of bounded variation Added Tex. Feb24 reviewed Approve Is $f(x)=\frac{\cos \left(x\right)}{1+x^2}$ uniformly continuous? Feb23 reviewed Approve Power series divergence (real analysis) Feb23 reviewed No Action Needed Calculus problem about equality of series and integral Feb19 reviewed Approve exotic smooth structures Feb19 awarded Custodian Feb19 reviewed Looks OK What is the limit of $\lim_{x\to -\infty}\frac{\sqrt{x^2}}{x}$? Feb19 reviewed Approve Let $x = (11, 2)^T$ . Find both reflection matrices $M$ such that $Mx$ is a multiple of $e_1$. Feb17 awarded Custodian Feb17 reviewed Approve Analysis question about density of rationals Feb16 comment converge absolutely/conditionally : (cos(npi)) / ((n+1)ln(n+1))? You're welcome! Feb16 comment converge absolutely/conditionally : (cos(npi)) / ((n+1)ln(n+1))? Try $u=\ln(x+1)$. Feb16 answered converge absolutely/conditionally : (cos(npi)) / ((n+1)ln(n+1))? Feb16 comment Is there a function that is differentiable but not integrable? @Robert The Riemann integral is defined on the closed interval, I'm sure you will see this if you look in your textbook. This is also discussed on this site, see for instance: math.stackexchange.com/questions/461459/… Feb16 comment Is there a function that is differentiable but not integrable? To be clear, I refer to your last statement, that the function is Riemann integrable.