Reputation
1,902
Next privilege 2,000 Rep.
Edit questions and answers
Badges
2 11 27
Impact
~46k people reached

Apr
28
asked Is this lemma about the minimal distance of two lines true?
Apr
25
awarded  Enthusiast
Apr
12
comment Solving a scrambled $3 \times 3 \times 3$ Rubik's Cube with at most 20 moves!
I would suggest looking on Wikipedia And also here
Apr
6
comment Please help me to show, that $(\ln x)'=\frac1 x$
Thank you. Great answer.
Apr
6
accepted Please help me to show, that $(\ln x)'=\frac1 x$
Apr
6
comment Please help me to show, that $(\ln x)'=\frac1 x$
@Arturo Magidin: Thank you very much.
Apr
6
comment Please help me to show, that $(\ln x)'=\frac1 x$
@quanta: Please don't cheat. I want to get an answer I can use to understand the derivation. But anyway, thanks for the definition.
Apr
6
comment Please help me to show, that $(\ln x)'=\frac1 x$
Ah... Okay. And how to show, that $\lim_{\delta\to\infty}\ln\left(1-\frac1{x\delta}\right)^\delta = x^{-1}?$
Apr
6
comment Please help me to show, that $(\ln x)'=\frac1 x$
@Fabian: In our school, we are doing l'Hôpital in grade 11, I don't want to wait that long ;)
Apr
6
comment Please help me to show, that $(\ln x)'=\frac1 x$
@Arturo Magidin: Yes. Sorry. Got confused by myself.
Apr
6
asked Please help me to show, that $(\ln x)'=\frac1 x$
Apr
4
comment Common algorithm with an order of Θ(2^n)
Hm... I'm not a mathematician. Thank you.
Apr
4
answered Common algorithm with an order of Θ(2^n)
Apr
4
revised wave equation and superposition
Texify images
Apr
4
suggested approved edit on wave equation and superposition
Mar
30
accepted Find a closed form for this sequence: $a_{n+1} = a_n + a_n^{-1}$
Mar
29
comment Find a closed form for this sequence: $a_{n+1} = a_n + a_n^{-1}$
That's still only an asymptotic.
Mar
29
asked Find a closed form for this sequence: $a_{n+1} = a_n + a_n^{-1}$
Mar
23
revised factorization of a^n+1?
Encapsulate $\LaTeX$ into dollars.
Mar
23
suggested approved edit on factorization of a^n+1?