The k-Coloring problem is to test whether a graph can be colored with at most k colors such that no two adjacent vertices receive the same color. If a graph G does not contain a graph H as an induced subgraph, then G is called H-free. For any fixed graph H on at most 6 vertices, it is known that 3-Coloring is polynomial-time solvable on H-free graphs whenever H is a linear forest and NP-complete otherwise. By solving the missing case P 2+P 3, we prove the same result for 4-Coloring provided that H is a fixed graph on at most 5 vertices. © 2012 Springer-Verlag.
CITATION STYLE
Golovach, P. A., Paulusma, D., & Song, J. (2012). 4-Coloring H-free graphs when H is small. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 7147 LNCS, pp. 289–300). https://doi.org/10.1007/978-3-642-27660-6_24
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