Cycles as edge intersection hypergraphs (1902.00396v1)

Abstract: If ${\cal H}=(V,{\cal E})$ is a hypergraph, its edge intersection hypergraph $EI({\cal H})=(V,{\cal E}^{EI})$ has the edge set ${\cal E}^{EI}={e_1 \cap e_2 \ |\ e_1, e_2 \in {\cal E} \ \wedge \ e_1 \neq e_2 \ \wedge \ |e_1 \cap e_2 |\geq2}$. Picking up a problem from arXiv:1901.06292, for $n \ge 24$ we prove that there is a 3-regular (and - if $n$ is even - 6-uniform) hypergraph ${\cal H}=(V,{\cal E})$ with $\lceil \frac{n}{2} \rceil$ hyperedges and $EI({\cal H}) = C_n$.