User Dominic van der Zypen

7 votes

2 answers

268 views

Meeting a set of lines in $\mathbb{R}^n$

asked Aug 7, 2017 at 7:04

7 votes

2 answers

383 views

Infinite projective plane with small edges

asked Dec 3, 2017 at 15:40

7 votes

1 answer

452 views

Surjective group homomorphism from $\text{Sym}(X)$ onto $\mathbb{Z}$

asked Apr 21, 2018 at 8:08

7 votes

1 answer

154 views

Injective additive grids

asked Feb 9, 2018 at 7:40

7 votes

0 answers

196 views

Does the Weak Power Hypothesis imply the Boolean Prime Ideal Theorem?

asked Feb 12, 2023 at 8:08

7 votes

2 answers

496 views

Counterexample for Chvatal's conjecture in an infinite set

asked Oct 11, 2022 at 12:06

7 votes

1 answer

304 views

Dedekind-finite-to-one vs Dedekind-finite

asked Aug 7, 2023 at 10:07

7 votes

1 answer

165 views

$|G|/\alpha(G) \leq \eta(G)$ where $\eta(G)$ is the Hadwiger number

asked May 13 at 20:07

7 votes

1 answer

459 views

Is it consistent that $|[\kappa]^{<\kappa}| > \kappa$?

asked Feb 18, 2019 at 13:29

7 votes

1 answer

192 views

Non-tensor-representable ultrafilters on $\omega$

asked Mar 11, 2019 at 9:45

7 votes

1 answer

166 views

$2$-determined Hausdorff spaces

asked Sep 12, 2018 at 7:34

7 votes

2 answers

344 views

Surjective order-preserving map $f:{\cal P}(X)\to \text{Part}(X)$

asked Sep 27, 2018 at 10:54

7 votes

1 answer

99 views

Label distance number and chromatic number of a graph

asked Jul 20, 2019 at 17:40

7 votes

1 answer

241 views

On subsets of $\mathbb{N}$ reciprocally summable to $1$

asked Aug 18, 2019 at 19:52

7 votes

1 answer

214 views

Embeddability of all graphs of cardinality $\kappa$ into one graph of cardinality $\kappa$

asked Oct 22, 2019 at 12:32

7 votes

1 answer

161 views

Minimal generating set for $S_\omega$

asked Mar 21, 2020 at 7:22

7 votes

1 answer

195 views

Bounding and domination numbers for relation $\leq$ modulo $\omega$-nullsets

asked Feb 10, 2020 at 15:15

7 votes

3 answers

2k views

"Gray code" for building teams

asked Jun 17, 2020 at 19:51

7 votes

1 answer

830 views

Density of perfect numbers

asked Aug 14 at 8:03

6 votes

1 answer

218 views

Maximizing the mutual Hamming distance in $\big[{\cal P}([n])\big]^n$

asked Aug 21 at 14:01

6 votes

0 answers

254 views

Maximal bijection-dodging families on $\mathbb{N}$

asked Jun 18 at 7:03

6 votes

1 answer

173 views

$\omega$-de-Bruijn sequences

asked Oct 26 at 18:50

6 votes

2 answers

736 views

Shifting an irrational binary sequence

asked Dec 9 at 14:31

6 votes

1 answer

166 views

Embedding any graph into a vertex-transitive graph of the same chromatic number

asked Aug 24, 2020 at 18:29

6 votes

3 answers

443 views

Approximating by incrementing positive integers

asked Aug 27, 2020 at 8:14

6 votes

1 answer

287 views

Singular cardinal $\kappa$ with projective plane such that all edges have cardinality $<\kappa$

asked Sep 10, 2020 at 7:46

6 votes

3 answers

472 views

Spaces with unique endomorphism monoids

asked Mar 29, 2020 at 13:48

6 votes

1 answer

213 views

Pairwise non-isomorphic interval-isomorphic lattices

asked Sep 2, 2019 at 15:25

6 votes

2 answers

303 views

Is there a set $S\subseteq [0,1]$ with $|S|=2^{\aleph_0}$ and distinct pairwise distances?

asked Oct 12, 2018 at 9:33

6 votes

1 answer

316 views

Are Gray codes in $\{0,1\}^n$ isomorphic?

asked Oct 18, 2018 at 11:36

Stack Exchange Network

1,209 Questions

Meeting a set of lines in $\mathbb{R}^n$

Infinite projective plane with small edges

Surjective group homomorphism from $\text{Sym}(X)$ onto $\mathbb{Z}$

Injective additive grids

Does the Weak Power Hypothesis imply the Boolean Prime Ideal Theorem?

Counterexample for Chvatal's conjecture in an infinite set

Dedekind-finite-to-one vs Dedekind-finite

$|G|/\alpha(G) \leq \eta(G)$ where $\eta(G)$ is the Hadwiger number

Is it consistent that $|[\kappa]^{<\kappa}| > \kappa$?

Non-tensor-representable ultrafilters on $\omega$

$2$-determined Hausdorff spaces

Surjective order-preserving map $f:{\cal P}(X)\to \text{Part}(X)$

Label distance number and chromatic number of a graph

On subsets of $\mathbb{N}$ reciprocally summable to $1$

Embeddability of all graphs of cardinality $\kappa$ into one graph of cardinality $\kappa$

Minimal generating set for $S_\omega$

Bounding and domination numbers for relation $\leq$ modulo $\omega$-nullsets

"Gray code" for building teams

Density of perfect numbers

Maximizing the mutual Hamming distance in $\big[{\cal P}([n])\big]^n$

Maximal bijection-dodging families on $\mathbb{N}$

$\omega$-de-Bruijn sequences

Shifting an irrational binary sequence

Embedding any graph into a vertex-transitive graph of the same chromatic number

Approximating by incrementing positive integers

Singular cardinal $\kappa$ with projective plane such that all edges have cardinality $<\kappa$

Spaces with unique endomorphism monoids

Pairwise non-isomorphic interval-isomorphic lattices

Is there a set $S\subseteq [0,1]$ with $|S|=2^{\aleph_0}$ and distinct pairwise distances?

Are Gray codes in $\{0,1\}^n$ isomorphic?