10,215 reputation
33066
bio website
location Moscow, Russia
age
visits member for 4 years
seen 3 hours ago

umagon at google mail


2d
reviewed Leave Closed A persisting element in all subgroups.
Jul
26
reviewed Close New computer complex biochemistry verses old computer
Jul
26
reviewed Looks OK Prove that $s_n \leq 1+\ln n$, where $s_n$ is the $n$th partial sum of the harmonic series
Jul
26
reviewed Close Prove that $16 \cos 12^\circ ·\cos 24^\circ ·\cos 48^\circ· \cos 96^\circ ·\cos 192^\circ = 1$
Jul
26
reviewed Close Show that something follow power law
Jul
26
reviewed Close Probability of a 21 deck with jokers
Jul
26
reviewed Leave Closed Solve $e^x-1= 2x$ with numerical or analytical methods.
Jul
26
reviewed Looks OK Convergence of $a_n=1+1/5+1/9+\ldots+\frac{1}{4n-3}$
Jul
25
reviewed Looks OK Proving an expression is composite
Jul
25
reviewed No Action Needed Do all primes $p$ except 2 and 3 divide the sum of the squares of integers from 0 to $p - 1$?
Jul
25
reviewed Looks OK Find two functions given properties of their limits
Jul
25
reviewed Reviewed Time and work aptitude problem for CAT preparation
Jul
25
reviewed Leave Closed Prove that: $\frac{1}{11+a^2}+\frac{1}{11+b^2}+\frac{1}{11+c^2}+\frac{1}{11+d^2} \leq \frac{1}{3}$
Jul
25
reviewed Leave Closed Solve for x: sin2 x − cos2 x = sin x, −π ≤ x ≤π
Jul
25
reviewed Close Can we deduce that $X$ is $\sigma-$compact?
Jul
25
reviewed No Action Needed Does this property of normal subgroups have a name?
Jul
25
reviewed Close Simplify $\sec(x + \pi/2)$
Jul
24
reviewed Leave Closed Fibonacci series, which is most pure mathematically?
Jul
24
reviewed Leave Closed Why Must the Degree of this Map be 0?
Jul
24
revised The Name for $\mathbb{R}$, $\mathbb{C}$, $\mathbb{H}$ and $\mathbb{O}$ Exclusively Algebras?
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