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2008 MINIMAX DEGREES OF QUASIPLANAR GRAPHS WITH NO SHORT CYCLES OTHER THAN TRIANGLES
Oleg V. Borodin, Anna O. Ivanova, Alexandr V. Kostochka, Naeem N. Sheikh
Taiwanese J. Math. 12(4): 873-886 (2008). DOI: 10.11650/twjm/1500404982

Abstract

For an edge $xy$, let $M(xy)$ be the maximum of the degrees of $x$ and $y$. The {\em minimax degree} (or $M$-degree) of a graph $G$ is $M^*(G)=\min\{M(xy)| xy\in E(G)\}$. In order to get upper bounds on the game chromatic number of planar graphs, He, Hou, Lih, Shao, Wang, and Zhu showed that every planar graph $G$ without leaves and $4$-cycles has minimax degree at most $8$, which was improved by Borodin, Kostochka, Sheikh, and Yu to the sharp bound $7$. We show that every planar graph $G$ without leaves and $4$- and $5$-cycles has $M$-degree at most $5$, which bound is sharp. We also show that every planar graph $G$ without leaves and cycles of length from $4$ to $7$ has $M$-degree at most $4$, which bound is attained even on planar graphs with no cycles of length from $4$ to arbitrarily large number. Besides, we give sufficient conditions for a planar graph to have $M$-degrees $3$ and $2$. Similar results are obtained for graphs embeddable into the projective plane, the torus and the Klein bottle.

Citation

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Oleg V. Borodin. Anna O. Ivanova. Alexandr V. Kostochka. Naeem N. Sheikh. "MINIMAX DEGREES OF QUASIPLANAR GRAPHS WITH NO SHORT CYCLES OTHER THAN TRIANGLES." Taiwanese J. Math. 12 (4) 873 - 886, 2008. https://doi.org/10.11650/twjm/1500404982

Information

Published: 2008
First available in Project Euclid: 18 July 2017

zbMATH: 1163.05013
MathSciNet: MR2426533
Digital Object Identifier: 10.11650/twjm/1500404982

Subjects:
Primary: 05C15

Keywords: Decomposition , Planar graphs , short cycles

Rights: Copyright © 2008 The Mathematical Society of the Republic of China

Vol.12 • No. 4 • 2008
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