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List coloring digraphs
Author(s) -
Bensmail Julien,
Harutyunyan Ararat,
Le Ngoc Khang
Publication year - 2018
Publication title -
journal of graph theory
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.164
H-Index - 54
eISSN - 1097-0118
pISSN - 0364-9024
DOI - 10.1002/jgt.22170
Subject(s) - digraph , combinatorics , mathematics , bipartite graph , vertex (graph theory) , chromatic scale , conjecture , discrete mathematics , invariant (physics) , graph , mathematical physics
The dichromatic numberχ ⃗ ( D )of a digraph D is the least number k such that the vertex set of D can be partitioned into k parts each of which induces an acyclic subdigraph. Introduced by Neumann‐Lara in 1982, this digraph invariant shares many properties with the usual chromatic number of graphs and can be seen as the natural analog of the graph chromatic number. In this article, we study the list dichromatic number of digraphs, giving evidence that this notion generalizes the list chromatic number of graphs. We first prove that the list dichromatic number and the dichromatic number behave the same in many contexts, such as in small digraphs (by proving a directed version of Ohba's conjecture), tournaments, and random digraphs. We then consider bipartite digraphs, and show that their list dichromatic number can be as large as Ω ( log 2 n ) . We finally give a Brooks‐type upper bound on the list dichromatic number of digon‐free digraphs.