## Abstract It is well known that every planar graph __G__ is 2βcolorable in such a way that no 3βcycle of __G__ is monochromatic. In this paper, we prove that __G__ has a 2βcoloring such that no cycle of length 3 or 4 is monochromatic. The complete graph __K__~5~ does not admit such a coloring. On
Vertex colorings of graphs without short odd cycles
β Scribed by Andrzej Dudek; Reshma Ramadurai
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 118 KB
- Volume
- 68
- Category
- Article
- ISSN
- 0364-9024
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β¦ Synopsis
Motivated by the work of NeΕ‘etΕil and R ΓΆdl on "Partitions of vertices" we are interested in obtaining some quantitative extensions of their result. In particular, given a natural number r and a graph G of order m with odd girth g, we show the existence of a graph H with odd girth at least g and order that is polynomial in m such that every r-coloring of the vertices of H yields a monochromatic and induced copy of G. α§ 2010 Wiley
π SIMILAR VOLUMES
It is shown that there is a constant \(c\) such that if \(G\) is a graph embedded in a surface of genus \(g\) (either orientable or non-orientable) and the length of a shortest non-bounding cycle of \(G\) is at least \(c \log (g+1)\), then \(G\) is six-colorable. A similar result holds for three- an
It is shown that any 4-chromatic graph on n vertices contains an odd cycle of length smaller than β 8n.
## Abstract Let __G__ be a toroidal graph without cycles of a fixed length __k__, and Ο~__l__~(__G__) the list chromatic number of __G__. We establish tight upper bounds of Ο~__l__~(__G__) for the following values of __k__: Β© 2009 Wiley Periodicals, Inc. J Graph Theory 65: 1β15, 2010.