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Graph Subcolorings: Complexity and Algorithms

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Graph-Theoretic Concepts in Computer Science (WG 2001)

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Abstract

In a graph coloring, each color class induces a disjoint union of isolated vertices. A graph subcoloring generalizes this concept, since here each color class induces a disjoint union of complete graphs. Erdős and independently Albertson et al. proved that every graph of maximum degree at most 3 has a 2-subcoloring.We point out in this paper that this fact is best possible with respect to degree-constraints by showing that the problem of recognizing 2-subcolorable graphs with maximum degree 4 is NP-complete, even when restricted to triangle-free planar graphs. Moreover, in general, for fixed k, recognizing k-subcolorable graphs is NP-complete on graphs with maximum degree at most k 2. In contrast, we show that, for arbitrary k, k-SUBCOLORABILITY can be computed efficiently on graphs of bounded treewidth and on cographs.

Research supported in part by EU ARACNE project HPRN-CT-1999-00112 and EU APPOL project IST-1999-14084

Financial support by Deutsche Forschungsgemeinschaft is gratefully acknowledged.

Supported by the Ministery of Education of the Czech Republic as project LN00A056

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Fiala, J., Jansen, K., Le, V.B., Seidel, E. (2001). Graph Subcolorings: Complexity and Algorithms. In: Brandstädt, A., Le, V.B. (eds) Graph-Theoretic Concepts in Computer Science. WG 2001. Lecture Notes in Computer Science, vol 2204. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45477-2_15

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  • DOI: https://doi.org/10.1007/3-540-45477-2_15

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