MathOverflow
ar.grig's user avatar
ar.grig's user avatar
ar.grig's user avatar
ar.grig
  • Member for 6 years, 4 months
  • Last seen more than 2 years ago
  • Armenia
Profile Activity

20 Questions

Score Activity Newest Views
11 votes
2 answers
849 views

Existence of subset of reals such that any real number is unique sum of exactly two elements of the subset

12 votes
1 answer
486 views

Selective ultrafilter and bijective mapping

6 votes
1 answer
474 views

Permutation on $\omega$ and Ramsey ultrafilter

7 votes
1 answer
422 views

Ultrafilter on the ordinal $\omega^\omega$

4 votes
1 answer
403 views

Function on the set of limit countable ordinals

3 votes
2 answers
365 views

Selective ultrafilter on $\omega$ is normal. Clear proof

4 votes
1 answer
318 views

On a completeness property of hyperreals

6 votes
1 answer
284 views

On infinite combinatorics of ultrafilters

2 votes
2 answers
272 views

Rational representation of reals [closed]

5 votes
1 answer
222 views

Club filter basis in $\omega_1$

4 votes
1 answer
190 views

The property of the dense subfilter of a selective ultrafilter

3 votes
1 answer
158 views

Real analytic function of one variable with given set of values

3 votes
1 answer
153 views

Dense filter and selective ultrafilter

0 votes
1 answer
147 views

Finitely additive measure on Cartesian square of countable set

1 vote
2 answers
134 views

Existence of $\alpha$-sequence of infinitesimal sequences with $\alpha>\omega_1$

1 vote
1 answer
132 views

On a case of real-analytic interpolation

1 vote
1 answer
117 views

Some kind of idempotence of dense filter

4 votes
1 answer
117 views

The example of the idempotent filter or subsets family with finite intersections property

2 votes
1 answer
91 views

Dense subfilter of selective ultrafilter

1 vote
0 answers
63 views

Real-analytic function with given set of values [closed]