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Alex Ravsky
  • Member for 9 years, 4 months
  • Last seen this week
  • Lviv, Ukraine
17 votes
1 answer
366 views

Is a finite group determined by the family of all its 2-generated subgroups?

15 votes
2 answers
753 views

Asymptotics of the sum of squares of binomial coefficients

11 votes
0 answers
211 views

Asymptotics of the lower approximation of a pair of natural numbers by a coprime pair

11 votes
3 answers
486 views

An extrasensory perception strategy :-)

11 votes
1 answer
146 views

Is a polynomial $y^n+y^{n-1}-x^m-x^{m-1}$ irreducible in $\Bbb Z[x,y]$?

11 votes
0 answers
136 views

The fair soup division and approximating numbers

10 votes
1 answer
200 views

An example of a compact multiplicatively unbounded ring

9 votes
1 answer
215 views

Using a time machine that can jump to a permutation of the current year

5 votes
1 answer
349 views

Is there a homomorphism from a full product of finite cyclic groups onto $\mathbb Z$?

4 votes
1 answer
200 views

For which $q$ there exists a Steiner system $S(2, q, q^2)$?

4 votes
0 answers
106 views

A rather non-$F_\sigma$ Borel set

3 votes
1 answer
64 views

An estimation of a sum by $\ell_p$-norm

3 votes
1 answer
119 views

Estimation of a probability of marginal values of a random variable

2 votes
0 answers
228 views

Which are nontrivial examples of analytical functions on Frechet spaces?

2 votes
1 answer
451 views

Expected number of moves of a random walk inside a simplex

1 vote
0 answers
122 views

Two closest sums of pairs of reciprocals

1 vote
0 answers
56 views

Is there a special one-parametric solution of an equation $y^n+y^{n-1}=x^m+x^{m-1}$?

1 vote
0 answers
89 views

Specific balanced block designs

0 votes
1 answer
104 views

A binary relation contained in its square

0 votes
0 answers
70 views

Closest sums of pairs of reciprocals of prime numbers