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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 $u=\ln(x+1)$.