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 Mar 29 reviewed No Action Needed About signal processing and Fourier transform and S-transform? Mar 29 reviewed No Action Needed Integration symbol Mar 29 reviewed Approve Integration symbol Mar 29 comment How can we show that $\frac{\rm d}{{\rm d}x}\sum_{n\in\mathbb N_0}x^n=\sum_{n\in\mathbb N_0}\frac{\rm d}{{\rm d}x}x^n$? Possible duplicate of How can I evaluate $\sum_{n=0}^\infty (n+1)x^n$ Mar 29 comment How can we show that $\frac{\rm d}{{\rm d}x}\sum_{n\in\mathbb N_0}x^n=\sum_{n\in\mathbb N_0}\frac{\rm d}{{\rm d}x}x^n$? $0^0=1$ for most practical uses Mar 29 comment Show that $\exists a,b$ such that $f'(a) = 1$ and $f'(b) = -1$ Actually, it is going to be easy -- try $1/2\pi n$ for any $n$. Jan 9 awarded Enlightened Jan 9 awarded Nice Answer Dec 23 awarded Yearling Dec 19 reviewed Edit $\mathbb{Z}[i]$ is principal. And what are the units Dec 19 revised $\mathbb{Z}[i]$ is principal. And what are the units $was missing everywhere. By inserting this symbol your question will be more beautiful. Also Z was not written properly. Jul 20 reviewed Reject Solve the equation. e and natural logs Jul 19 reviewed Reject Is this Applied Mathematics? Jul 15 reviewed Approve Find a bijection from$\mathbb R$to$\mathbb R-\mathbb N$Mar 11 revised A game with$\delta$,$\epsilon$and uniform continuity. edited body Mar 11 comment A game with$\delta$,$\epsilon\$ and uniform continuity. @Uzman, indeed. Thank you, I corrected the mistake. Feb 15 reviewed Reject non-intersecting lines inside a projective quadric Feb 15 comment A peasant and his cows Hmmm.. why don't you merge them? Nevermind. Feb 15 comment A peasant and his cows two answers? why? Feb 15 revised A peasant and his cows added 435 characters in body