10,577 reputation
33676
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location Moscow, Russia
age
visits member for 4 years, 5 months
seen 15 mins ago

umagon at google mail


17m
reviewed Leave Open formula for summation notation involving variable powers
17m
reviewed Close Evaluating a complex integral using the Cauchy integral formula
1h
reviewed No Action Needed How do I know if a given polynomial is a quasi polynomial?
1h
reviewed Close Why do we need to learn Set Theory?
1h
reviewed Reviewed Topology; Definition of the open ball and open sets confuses me
1h
reviewed No Action Needed Exercise books on functional analysis
1h
reviewed Looks OK Why do we need to learn Set Theory?
1h
reviewed No Action Needed How to this Simplify Boolean Expression
1h
comment Is There An Injective Cubic Polynomial $\mathbb Z^2 \rightarrow \mathbb Z$?
Related: Polynomial bijection from ℚ×ℚ to ℚ? @ MO
2h
answered An example where $\frac{(2m)!(2n)!}{m!n!(m + n)!}$ is the number of ways of counting something?
2h
reviewed Reject Existence of finite sets of infinite set without using AC
2h
reviewed Reject Deriving angle from sin or cos
2h
reviewed Reject Find the sum of digits of m?
3h
reviewed Close About an unpredictable sequence of primes
4h
reviewed Reviewed How the picture of DETERMINANTS come up?
4h
comment How the picture of DETERMINANTS come up?
See math.stackexchange.com/q/668 and links there
4h
reviewed Close find minimize of a function with linear program
4h
reviewed Close # Can you solve this simple problem in euclidean geometry?
5h
awarded  Enlightened
6h
awarded  Nice Answer