English

Intersecting longest paths in chordal graphs

Combinatorics 2020-12-15 v1

Abstract

We consider the size of the smallest set of vertices required to intersect every longest path in a chordal graph. Such sets are known as longest path transversals. We show that if ω(G)\omega(G) is the clique number of a chordal graph GG, then there is a transversal of order at most 4ω(G)54\lceil\frac{\omega(G)}{5}\rceil. We also consider the analogous question for longest cycles, and show that if GG is a 2-connected chordal graph then there is a transversal intersecting all longest cycles of order at most 2ω(G)32\lceil\frac{\omega(G)}{3}\rceil.

Keywords

Cite

@article{arxiv.2012.07221,
  title  = {Intersecting longest paths in chordal graphs},
  author = {Daniel J. Harvey and Michael S. Payne},
  journal= {arXiv preprint arXiv:2012.07221},
  year   = {2020}
}

Comments

11 pages

R2 v1 2026-06-23T20:56:21.821Z