10,586 reputation
33676
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location Moscow, Russia
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visits member for 4 years, 5 months
seen 13 mins ago

umagon at google mail


19m
reviewed Leave Closed Mnyfld difference
19m
reviewed Close prove that $O^{\pi}(G) \leq K$ .
1h
answered Evaluating Combination Sums
1h
reviewed Close Evaluate Integral
1h
reviewed No Action Needed Find all parameters for for which the series is convergent - checking
2h
reviewed Leave Closed In a finite ring, if $xy=1$, show $yx=1$.
2h
comment Evaluating Combination Sums
Related: math.stackexchange.com/q/121407
3h
revised Solve $x^6 \equiv x \pmod{396}$
edited tags
3h
reviewed Close vector to diagonal matrix operations/decomposition
3h
reviewed Leave Closed Math newbie: what to read?
3h
reviewed Reviewed Find $ \int_{\theta_0}^{\theta} \cos \theta \left( \sin 2\theta \right)^{3/2} \, \mathrm{d}\theta $
4h
reviewed Close Is $z/\sin z$ analytic in the complex plane?
4h
revised How to calculate variant of geometric series based on sequences of Catalan numbers?
edited tags
4h
comment How to calculate variant of geometric series based on sequences of Catalan numbers?
en.wikipedia.org/wiki/Catalan_number#First_proof
5h
reviewed Leave Open formula for summation notation involving variable powers
5h
reviewed Close Evaluating a complex integral using the Cauchy integral formula
6h
reviewed No Action Needed How do I know if a given polynomial is a quasi polynomial?
6h
reviewed Close Why do we need to learn Set Theory?
6h
reviewed Reviewed Topology; Definition of the open ball and open sets confuses me
6h
reviewed Looks OK Why do we need to learn Set Theory?