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Apr
29
accepted Is this lemma about the minimal distance of two lines true?
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.