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Mathematics
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zhoraster
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Academic Director and Professor at Kyiv School of Economics. I specialize mainly in Probability Theory.

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63
I roll a die repeatedly until I get 6, and then count the number of 3s I got. What's my expected number of 3s?
Sep 6, 2015
37
What's the difference between stochastic and random?
Jan 18, 2016
22
Lower bound of Gaussian tail?
Sep 16, 2015
19
Combinatorial proof of identity involving central binomial coefficients $ \sum_{k=0}^{n-1} {2k \choose k} \cdot 2^{2(n-k)} = 2n \cdot {2n \choose n}$
Mar 3, 2020
17
On average, how many times must a circular pizza be randomly cut, to get a piece with no curved edge?
Jun 11, 2023
17
Factoring $1+x+\dots +x^n$ into a product of polynomials with positive coefficients
Mar 28, 2017
12
Step in computation of the expected cover time for the simple random walk on a discrete circle
Sep 21, 2015
12
If $f$ is uniformly continuous and $\int_\mathbb{R}|f(x)x^a|dx<\infty$ then $|f(x)x^b|$ is bounded for some $b\in(0,a]$
Mar 11, 2022
11
Show $\mathbb{E}[f(X)g(X)] \geq \mathbb{E}[f(X)]\mathbb{E}[g(X)]$ for $f,g$ bounded, nondecreasing
Sep 22, 2015
11
concentration of maximum of gaussians
Oct 2, 2015
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How to tell a user that his/her actions are inappropriate (and should I)
7
Are user names in the audits completely random?
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67
Noteworthy, but not so famous conjectures resolved recent years
26
Are there more connected or disconnected graphs on $n$ vertices?
23
Examples of common false beliefs in mathematics
20
Pseudonyms of famous mathematicians
13
What are the best practices for giving online tests?