English

On snarks that are far from being 3-edge colorable

Combinatorics 2012-03-12 v1 Discrete Mathematics

Abstract

In this note we construct two infinite snark families which have high oddness and low circumference compared to the number of vertices. Using this construction, we also give a counterexample to a suggested strengthening of Fulkerson's conjecture by showing that the Petersen graph is not the only cyclically 4-edge connected cubic graph which require at least five perfect matchings to cover its edges. Furthermore the counterexample presented has the interesting property that no 2-factor can be part of a cycle double cover.

Keywords

Cite

@article{arxiv.1203.2015,
  title  = {On snarks that are far from being 3-edge colorable},
  author = {Jonas Hägglund},
  journal= {arXiv preprint arXiv:1203.2015},
  year   = {2012}
}

Comments

10 pages, 7 figures

R2 v1 2026-06-21T20:31:35.957Z