A -color theorem for surfaces of genus

Authors:
Kenneth A. Berman and Jerome L. Paul

Journal:
Proc. Amer. Math. Soc. **105** (1989), 513-522

MSC:
Primary 05C15

MathSciNet review:
949874

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Abstract: For a set of graphs, define the bounded chromatic number (resp. the bounded path chromatic number ) to be the minimum number of colors for which there exists a constant such that every graph can be vertex -colored so that all but vertices of are properly colored (resp. the length of the longest monochromatic path in is at most ). For the set of toroidal graphs, Albertson and Stromquist [1] conjectured that the bounded chromatic number is 4. For any fixed , let denote the set of graphs of genus . The Albertson-Stromquist conjecture can be extended to the conjecture that for all . In this paper we show that . We also show that the bounded path chromatic number equals 4 for all . Let denote the minimum such that every graph of genus on vertices can be -colored without forcing monochromatic edges (a monochromatic path of length ). We also obtain bounds for and .

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DOI:
http://dx.doi.org/10.1090/S0002-9939-1989-0949874-1

Keywords:
Vertex coloring,
genus ,
chromatic number

Article copyright:
© Copyright 1989
American Mathematical Society