User Dominic van der Zypen

4 votes

1 answer

182 views

On the set of good approximators in the sense of Dirichlet's theorem

asked Dec 19, 2019 at 7:50

4 votes

1 answer

280 views

Model in $\mathsf{ZFC}$ such that ${\cal P}(\ldots)$ has "jumping property"

asked Nov 17, 2019 at 8:34

4 votes

1 answer

108 views

Are homogeneous $T_2$-spaces flexible?

asked Jul 3, 2018 at 9:44

4 votes

1 answer

164 views

Increasing the chromatic number by "folding" two vertices of distance 2

asked Sep 2, 2018 at 14:23

4 votes

1 answer

74 views

Optimal pseudotransversals

asked Nov 27, 2018 at 15:05

4 votes

3 answers

205 views

Expected distance of nearest matching pair in the game of pairs

asked Nov 28, 2018 at 15:12

4 votes

1 answer

260 views

Generalizing the $T_0$-axiom

asked Oct 11, 2018 at 11:54

4 votes

1 answer

221 views

Embedding ordinals with the order topology into connected $T_2$-spaces

asked Sep 20, 2018 at 15:24

4 votes

1 answer

135 views

Hamming representability of finite graphs

asked Jan 2, 2019 at 19:37

4 votes

0 answers

122 views

Maximal connected subtopologies

asked Dec 3, 2018 at 9:19

4 votes

1 answer

352 views

Squares in the set $\{\sum_{j=1}^m j^2: m\in\mathbb{N}\}$ [closed]

asked Apr 13, 2019 at 17:01

4 votes

1 answer

390 views

Models of $\mathsf{ZFC}$ with neither $P$- nor $Q$-points

asked Mar 24, 2019 at 9:10

4 votes

1 answer

159 views

Are two "perfectly dense" hypergraphs on $\mathbb{N}$ necessarily isomorphic?

asked Mar 2, 2019 at 9:19

4 votes

1 answer

259 views

Minimal cardinality of a filter base of a non-principal uniform ultrafilters

asked Mar 10, 2019 at 13:28

4 votes

1 answer

173 views

Graphs that are not $\mathbb{R}^2$-realizable

asked Feb 12, 2019 at 14:22

4 votes

1 answer

168 views

Contractible $T_2$-space without subspace homeomorphic to it

asked Feb 21, 2019 at 6:44

4 votes

1 answer

224 views

Shrinking and expanding pairs in bijections $\varphi:\mathbb{N}\to\mathbb{N}$

asked Jun 3 at 8:42

4 votes

1 answer

97 views

Chromatic numbers realised by almost disjoint subsets of $\omega$

asked Apr 9 at 20:53

4 votes

0 answers

157 views

Existence of space $Z$ such that $\text{Cont}(X,Z) \cong X$

asked May 8 at 13:04

4 votes

0 answers

118 views

Reorganizational matching

asked Jan 10 at 14:39

4 votes

0 answers

229 views

Optimal colorings

asked Mar 8 at 13:28

4 votes

1 answer

214 views

Weak Power Hypothesis and Dependent Choice

asked Feb 21 at 12:30

4 votes

1 answer

174 views

Maximal intersecting families on $\omega$ that are not ultrafilters

asked Oct 12, 2023 at 14:05

4 votes

0 answers

132 views

Does a critical graph have to be product-irreducible?

asked Nov 1, 2023 at 16:48

4 votes

1 answer

124 views

$\aleph_0$-uniform non-bipartite linear hypergraph

asked Nov 9, 2023 at 8:36

4 votes

1 answer

152 views

How much can we "shrink" intersecting families

asked Oct 6, 2023 at 11:21

4 votes

1 answer

260 views

Is ${\cal P}(\omega)/\text{(fin)}$ a fractal poset?

asked May 16, 2023 at 19:48

4 votes

0 answers

148 views

The monochromatic principle and the axiom of choice

asked Aug 2, 2023 at 13:16

4 votes

1 answer

277 views

Supremum of infimum of measure of members of a free ultrafilter

asked Nov 24, 2022 at 17:17

4 votes

2 answers

191 views

Ordinal-universal linear order on $\kappa$ elements

asked Nov 16, 2022 at 13:26

Stack Exchange Network

1,209 Questions

On the set of good approximators in the sense of Dirichlet's theorem

Model in $\mathsf{ZFC}$ such that ${\cal P}(\ldots)$ has "jumping property"

Are homogeneous $T_2$-spaces flexible?

Increasing the chromatic number by "folding" two vertices of distance 2

Optimal pseudotransversals

Expected distance of nearest matching pair in the game of pairs

Generalizing the $T_0$-axiom

Embedding ordinals with the order topology into connected $T_2$-spaces

Hamming representability of finite graphs

Maximal connected subtopologies

Squares in the set $\{\sum_{j=1}^m j^2: m\in\mathbb{N}\}$ [closed]

Models of $\mathsf{ZFC}$ with neither $P$- nor $Q$-points

Are two "perfectly dense" hypergraphs on $\mathbb{N}$ necessarily isomorphic?

Minimal cardinality of a filter base of a non-principal uniform ultrafilters

Graphs that are not $\mathbb{R}^2$-realizable

Contractible $T_2$-space without subspace homeomorphic to it

Shrinking and expanding pairs in bijections $\varphi:\mathbb{N}\to\mathbb{N}$

Chromatic numbers realised by almost disjoint subsets of $\omega$

Existence of space $Z$ such that $\text{Cont}(X,Z) \cong X$

Reorganizational matching

Optimal colorings

Weak Power Hypothesis and Dependent Choice

Maximal intersecting families on $\omega$ that are not ultrafilters

Does a critical graph have to be product-irreducible?

$\aleph_0$-uniform non-bipartite linear hypergraph

How much can we "shrink" intersecting families

Is ${\cal P}(\omega)/\text{(fin)}$ a fractal poset?

The monochromatic principle and the axiom of choice

Supremum of infimum of measure of members of a free ultrafilter

Ordinal-universal linear order on $\kappa$ elements