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Sorfosh
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question
20
You are given 8 fair coins and flip all of them at once. Then, you can reflip as many coins as you want. What is optimal expected number of heads?
May 2
question
13
Fake proof that $1$ is the solution of $x^2+x+1=0$
Jul 22, 2018
answer
8
Are polynomials on [0,1] dense in L1($\mu$)?
Feb 29, 2020
question
6
Find $\lim_{k \to \infty}\int_{0}^{\infty}ke^{-kx^2}\arctan(x)dx$
Apr 29, 2020
answer
6
The correct way to solve this equation :$\sqrt{-|x|}+\sqrt{|x|}=0$ in $\mathbb{R}$?
Feb 20, 2020
question
6
$\varphi$ monotone,continuous on $[0,1]$. Show $\varphi$ is AC, iff for any borel $f_n\to f$ in $L^1$,$\{\varphi(f_n)\}$ converges in measure.
Apr 23, 2020
question
6
Prove that $\sum_{n=1}^{\infty}\frac{q^n}{1+q^{2n}}=\sum_{n=1}^{\infty}(d_1(n)-d_3(n))q^n$
Jan 28, 2021
question
6
How to prove $f(z)=|z|$ is nowhere differentiable
Feb 21, 2017
question
5
Why in a directional derivative it has to be a unit vector [duplicate]
Oct 19, 2015
question
5
Why is the map $T(x,y)=(x,xy)$ not ergodic on $S^1\times S^1$.
Feb 24, 2021
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Graphing random points on the XY-plane