Abstract
In this paper we study the acyclic 3-colorability of some subclasses of planar graphs. First, we show that there exist infinite classes of cubic planar graphs that are not acyclically 3-colorable. Then, we show that every planar graph has a subdivision with one vertex per edge that is acyclically 3-colorable and provide a linear-time coloring algorithm. Finally, we characterize the series-parallel graphs for which every 3-coloring is acyclic and provide a linear-time recognition algorithm for such graphs.
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This work is partially supported by the Italian Ministry of Research, Grant number RBIP06BZW8, FIRB project “Advanced tracking system in intermodal freight transportation” and by MIUR of Italy under project AlgoDEEP prot. 2008TFBWL4. A preliminary version of this paper appeared at the 4th Workshop on Algorithms and Computation (WALCOM ’10) (Angelini and Frati 2010).
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Angelini, P., Frati, F. Acyclically 3-colorable planar graphs. J Comb Optim 24, 116–130 (2012). https://doi.org/10.1007/s10878-011-9385-3
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DOI: https://doi.org/10.1007/s10878-011-9385-3