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Discrete Mathematics & Theoretical Computer Science
Article . 2015 . Peer-reviewed
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DBLP
Article . 2015
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Snarks with total chromatic number 5

Authors: Gunnar Brinkmann; Myriam Preissmann; Diana Sasaki;

Snarks with total chromatic number 5

Abstract

Graph Theory A k-total-coloring of G is an assignment of k colors to the edges and vertices of G, so that adjacent and incident elements have different colors. The total chromatic number of G, denoted by χT(G), is the least k for which G has a k-total-coloring. It was proved by Rosenfeld that the total chromatic number of a cubic graph is either 4 or 5. Cubic graphs with χT = 4 are said to be Type 1, and cubic graphs with χT = 5 are said to be Type 2. Snarks are cyclically 4-edge-connected cubic graphs that do not allow a 3-edge-coloring. In 2003, Cavicchioli et al. asked for a Type 2 snark with girth at least 5. As neither Type 2 cubic graphs with girth at least 5 nor Type 2 snarks are known, this is taking two steps at once, and the two requirements of being a snark and having girth at least 5 should better be treated independently. In this paper we will show that the property of being a snark can be combined with being Type 2. We will give a construction that gives Type 2 snarks for each even vertex number n≥40. We will also give the result of a computer search showing that among all Type 2 cubic graphs on up to 32 vertices, all but three contain an induced chordless cycle of length 4. These three exceptions contain triangles. The question of the existence of a Type 2 cubic graph with girth at least 5 remains open.

Countries
Belgium, France
Related Organizations
Keywords

snark, total-coloring, [info.info-hc] computer science [cs]/human-computer interaction [cs.hc], [info.info-dm] computer science [cs]/discrete mathematics [cs.dm], [INFO.INFO-DM]Computer Science [cs]/Discrete Mathematics [cs.DM], FAMILIES, 510, 004, Mathematics and Statistics, CUBIC GRAPHS, QA1-939, edge-coloring, [INFO.INFO-HC]Computer Science [cs]/Human-Computer Interaction [cs.HC], Mathematics, GENERATION

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    influence
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
3
Average
Average
Average
Green
Published in a Diamond OA journal