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33781
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location Moscow, Russia
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visits member for 4 years, 6 months
seen 2 mins ago

Jan
12
reviewed Close Optimization problem of two variable
Jan
12
reviewed Close Show that function $f: A \to B$ is surjective when there is an implication: $g \circ f = h\circ f \to g=h$
Jan
12
reviewed Close $\lim\limits_{x\to\infty} \frac{\sqrt{(4x +3) +2\sqrt{1+ x}}}{\sqrt x}$ without L'Hôpital's rule
Jan
12
reviewed Leave Closed Open sets in locally compact spaces
Jan
12
reviewed Looks OK Limit of density points is a density point?
Jan
12
reviewed Close Property of double integrals
Jan
12
reviewed Close Is $\bigl(\sum {{x^n}\over{n!}} \bigr) \bigl(\sum {{y^n}\over{n!}} \bigr) = \bigl(\sum {{(x+y)^n}\over{n!}}\bigr)$ generalizable for series?
Jan
12
reviewed Close Find the Average Value please
Jan
12
reviewed Close prove the numbers in a sequence are all square number
Jan
12
reviewed Close How are contest problems designed?
Jan
12
reviewed Leave Closed Question on Semi-groups
Jan
11
answered A three variable binomial coefficient identity
Jan
11
reviewed Leave Open Definition of abs() function
Jan
11
reviewed Looks OK Find the limit of $\lim_{n\rightarrow\infty}(\frac{1}{2}+\frac{3}{2^2}+…+\frac{2n-1}{2^n})$
Jan
10
answered Combinatorial Identity
Jan
10
answered Finite summation with binomial coefficients, $\sum (-1)^k\binom{r}{k} \binom{k/2}{q}$
Jan
10
reviewed No Action Needed complex coordinates of perpendicular chords on unit circle
Jan
10
reviewed Looks OK Fundamental weights of $A_n$
Jan
10
reviewed Close For the birthday problem, what if a person was chosen beforehand?
Jan
10
revised The smallest $n> 0$ with the nonzero $n$th Stiefel-Whitney class is a power of 2 when total Stiefel-Whitney class is not trivial.
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