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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All Questions Answers
Score Newest
answer
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
answer
34
What's the difference between stochastic and random?
Jan 18, 2016
answer
20
Lower bound of Gaussian tail?
Sep 16, 2015
question
17
Factoring $1+x+\dots +x^n$ into a product of polynomials with positive coefficients
Mar 28, 2017
question
17
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
answer
14
On average, how many times must a circular pizza be randomly cut, to get a piece with no curved edge?
Jun 11
answer
12
Step in computation of the expected cover time for the simple random walk on a discrete circle
Sep 21, 2015
answer
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
answer
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
answer
11
Show $\sum \frac{n}{2^n + n} <\frac 32$
Oct 8, 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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Noteworthy, but not so famous conjectures resolved recent years
24
Are there more connected or disconnected graphs on $n$ vertices?
23
Examples of common false beliefs in mathematics
19
Pseudonyms of famous mathematicians
13
What are the best practices for giving online tests?

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