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 Enlightened
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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