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location Moscow, Russia
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visits member for 4 years, 2 months
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umagon at google mail


Jul
10
reviewed Close Definite integral $\int_0^{2\pi}(\cos^2(x)+a^2)^{-1}dx$
Jul
10
reviewed Close Arrange the functions…
Jul
10
reviewed Close A problem with the density of sin (N)
Jul
10
reviewed Close Prove that A is both open and closed.
Jul
10
reviewed Close Probability of socks with different colors
Jul
10
reviewed Close Closed-form term for $\sum_{i=1}^{\infty} i q^i$
Jul
10
reviewed Close Find values of the parameters in Predator prey model
Jul
9
reviewed Close $A+A^2B+B=0$ implies $A^2+I$ invertible?
Jul
9
reviewed Close How to understand some bewildering limits of sequences of sets
Jul
9
reviewed Close Why do probabilists have a preoccupation with urns?
Jul
9
reviewed Close Value of the logarithmic expression
Jul
9
reviewed Leave Closed Integral curves and ODE
Jul
9
reviewed Leave Closed Help with Pascal's rule equation
Jul
9
reviewed Leave Closed Convergence in Probability (weak law of large numbers)
Jul
9
reviewed Leave Closed What Is The Product Functor
Jul
9
reviewed Leave Closed Determine if the following functions are multiplicative…
Jul
9
comment Prove that $\sum_{k=0}^{m}\binom{m}{k}\binom{n+k}{m}=\sum_{k=0}^{m}\binom{n}{k}\binom{m}{k}2^k$
related: wiki: Delannoy numbers
Jul
8
comment Elementary, direct proof of when $5$ is a quadratic residue mod $p$
related: Special Cases of Quadratic Reciprocity and Counting Fixed Points
Jul
8
reviewed Close The future of the orbit of a point is a closed set
Jul
8
reviewed Looks OK Simple integral question