10,265 reputation
33066
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location Moscow, Russia
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visits member for 4 years, 1 month
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umagon at google mail


Aug
8
reviewed Looks OK To find the logarithm of $1728$ to the base $2 \sqrt{3}$
Jul
27
reviewed Leave Closed A persisting element in all subgroups.
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 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 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 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 Close Course And Bearing Word problem.
Jul
22
reviewed No Action Needed How did Le Verrier calculate Neptune's position?
Jul
22
reviewed Leave Open Explicit expression for homeomorphism and homotopy equivalence
Jul
22
reviewed No Action Needed Does the boundaries of non-disjoint sets in Euclidean space have common element?
Jul
22
reviewed Leave Closed How to find laplace transform of (t.sint.e^t)
Jul
21
reviewed Reviewed find a formula for $\sin3 \theta$ in terms of $\sin \theta$,$\cos \theta$ by using an angle-sum formula for sin(2θ+θ)