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Mathematics
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Siméon
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40
Collection of surprising identities and equations.
Sep 28, 2013
23
How to prove $ E(|X-Y|) \le E(|X+Y|)$ when $X,Y$ are i.i.d variables?
Jun 8, 2013
17
Does $\sum\frac{\sin n}{n}$ converge?
Mar 27, 2013
15
Evaluate $\lim\limits_{n \to\infty} \left(\frac{n-1} {2n+2}\right)^n$
Nov 25, 2013
13
Proof of the derivative of $x^n$
Oct 10, 2013
13
What was the first bit of mathematics that made you realize that math is beautiful? (For children's book)
Mar 7, 2013
13
True/False: $\mathop {\lim }\limits_{n \to \infty } {{{a_n}} \over {{b_n}}} = 1$ implies $\sum {{a_n},\sum {{b_n}} } $ converge or diverge together.
Dec 6, 2013
13
If $X+Y$ has the same distribution as $X$, is $Y$ almost surely zero?
Jun 24, 2013
12
Problem of limit with binomial coefficients
Jan 22, 2013
12
"$n$ is even iff $n^2$ is even" and other simple statements to teach proof-writing
Sep 30, 2013
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33
How quickly can the derivative of an everywhere differentiable function change sign?
17
Probability that $n$ is coprime to both $m$ and $m+1$
7
Write lines in Vim using a for loop