Dan Shved

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5,375 reputation
519
bio website danshved.wordpress.com
location Moscow, Russia
age 26
visits member for 6 months
seen 7 hours ago
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I'm a graduate student at MIPT, Russia. My thesis is in the theory of groups, but I like lots of other things too )


122 Answers

newest activity votes
76
Why is $\log(\sqrt{x^2+1}+x)$ odd?
26
solving $\sqrt{3-\sqrt{3+x}}=x$.
18
$\overline{xyz} =x!+y!+z!$
17
IMO 1987 - function
17
The product of digits equal to the sum of digits
14
Does $x_1^3+x_2^3+\dots+x_n^3+x_1+x_2+\dots+x_n=0$ implies $x_1+x_2+\dots+x_n=0$
11
Is it true that the order of $ab$ is always equal to the order of $ba$?
9
A question about the cardinality of the set of all the bijections from $M$ to itself
8
Finding summation
8
Can a graph be non 3-colourable without having k4 as a sub graph?
7
Is $\{-2,2\}$ a group under $a\star b=\max\{a,b\}$?
7
Value of Vandermonde type determinant
6
Find all differentiable functions $f$ such that $f\circ f=f$
6
Let $A$ be an $n\times n$ matrix over real numbers such that $AB=BA,$ for all $n\times n$ matrices $B$
6
prove sum of divisors of a square number is odd
5
Group of invertible elements
5
Suppose $R$ and $S$ are transitive relations on $A$. Prove that if $S \circ R \subseteq R \circ S$ then $R \circ S$ is transitive.
5
A divergent sequence whose average sequence converges
5
Show that all abelian groups of order 21 and 35 are cyclic.
5
Using combinatorial argument prove that $\frac{(3n)!}{2^n\times 3^n}$ is an integer.
5
Why are distinct maximal ideals coprime?
5
Divide a triangle into 2 equal area polygons
4
on the commutator subgroup of a special group
4
Embedding of $SO(3)$ into $S_{\infty}$
4
Products of positive definite matrices
4
Surjectivity of $G \rightarrow G/N_1 \times G/N_2$.
4
Proving collinear points
4
Find the value of the function at the given point.
4
How can I find this result modulo $10^8$?
4
Graph theory algorithm
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