English

Nearly all cacti are edge intersection hypergraphs of 3-uniform hypergraphs

Combinatorics 2019-06-14 v1

Abstract

If H=(V,E){\cal H}=(V,{\cal E}) is a hypergraph, its edge intersection hypergraph EI(H)=(V,EEI)EI({\cal H})=(V,{\cal E}^{EI}) has the edge set EEI={e1e2  e1,e2E  e1e2  e1e22}{\cal E}^{EI}=\{e_1 \cap e_2 \ |\ e_1, e_2 \in {\cal E} \ \wedge \ e_1 \neq e_2 \ \wedge \ |e_1 \cap e_2 |\geq2\}. Using the so-called clique-fusion, we show that nearly all cacti are edge intersection hypergraphs of 3-uniform hypergraphs. In the proof we make use of known characterizations of the trees and the cycles which are edge intersection hypergraphs of 3-uniform hypergraphs (see arXiv:1901.06292).

Keywords

Cite

@article{arxiv.1906.05639,
  title  = {Nearly all cacti are edge intersection hypergraphs of 3-uniform hypergraphs},
  author = {Martin Sonntag and Hanns-Martin Teichert},
  journal= {arXiv preprint arXiv:1906.05639},
  year   = {2019}
}

Comments

9 pages, 3 figures

R2 v1 2026-06-23T09:52:39.391Z