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May
20
revised A question on logic - where intuition can fail
fix syntax
May
20
comment A question on logic - where intuition can fail
$\overline A = \lnot A$. It's just another syntax for negation.
May
20
comment A question on logic - where intuition can fail
Is $\bigwedge_{x\in\{\}}P(x)$ true? And what about $\bigvee_{x\in\{\}}P(x)$? It is supposed to be false, isn't it? But thank you for that answer. It helped me quite much.
May
20
accepted A question on logic - where intuition can fail
May
20
asked A question on logic - where intuition can fail
May
19
comment Is there an algorithm to find the roots of high-order polynomials?
My question was, if the polynomial is expressable in terms of radicals, is it possible to give an algorithm to find them?
May
18
comment Is there an algorithm to find the roots of high-order polynomials?
I read the article and think, that you can certainly show that a polynomial's roots are describable in terms of radicands using the Galois Theory, but it doesn't explains you how to find them.
May
18
asked Is there an algorithm to find the roots of high-order polynomials?
May
10
comment Closed form for the sequence defined by $a_0=1$ and $a_{n+1} = a_n + a_n^{-1}$
I just tried to understand this answer again, but I didn't understood, why $2n+1+\sum_{0\le k<n}a_k^{-2}=2n+1+o(n)$
May
10
accepted Find a number $b$ such that $a\cdot b\equiv 1\mod m$
May
10
comment Find a number $b$ such that $a\cdot b\equiv 1\mod m$
@Asag Karagila: Yes.
May
10
asked Find a number $b$ such that $a\cdot b\equiv 1\mod m$
May
3
comment Need a result of Euler that is simple enough for a child to understand
Good idea. How about euler tours?
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.