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Dominic van der Zypen's user avatar
Dominic van der Zypen's user avatar
Dominic van der Zypen's user avatar
Dominic van der Zypen
  • Member for 14 years, 4 months
  • Last seen this week
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comment
Smallest ${\mathbf B}$-function $f:\omega\to( \omega\setminus\{0\})$
Ok thanks I overlooked this. Is there a smallest B-function? Will rephrase question
asked
Smallest ${\mathbf B}$-function $f:\omega\to( \omega\setminus\{0\})$
awarded
 Nice Answer
accepted
4-color theorem for hypergraphs
asked
4-color theorem for hypergraphs
accepted
Large almost disjoint family on $\mathbb{N}$ with property $\mathbf{B}$
awarded
 Notable Question
asked
Large almost disjoint family on $\mathbb{N}$ with property $\mathbf{B}$
accepted
Infinite complete minor in $\min,\max$-graph on $\mathbb{N}$
comment
Infinite complete minor in $\min,\max$-graph on $\mathbb{N}$
What's the definition of a topological minor?
asked
Infinite complete minor in $\min,\max$-graph on $\mathbb{N}$
accepted
Clique and chromatic number when removing an edge
asked
Clique and chromatic number when removing an edge
accepted
Isomorphic hypergraph duals
revised
Isomorphic hypergraph duals
added 52 characters in body
revised
Isomorphic hypergraph duals
edited title
comment
Isomorphic hypergraph duals
I have tried to make the title catchier. - @JukkaKohonen : $\varphi(e_1)= \text{im}(\varphi|_{e_1})$, so $\varphi(e_1)$ is the image of $e_1\subseteq V_1$ under $\varphi$. This is a subset of $V_2$. Now $E_2$ is a collection of subsets of $V_2$. Whence the requirement $\varphi(e_1)\in E_2$. Does that make sense?
asked
Isomorphic hypergraph duals
asked
Chromatic number of the dual hypergraph
comment
Maximal bijection-dodging families on $\mathbb{N}$
@ClaudeChaunier Do your considerations lead to a proof that every bijection-dodging family is contained in a maximal such one?
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