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QUADRILATERAL-TREE PLANAR RAMSEY NUMBERS

Part of: Graph theory

Published online by Cambridge University Press:  30 January 2018

XIAOLAN HU Open the ORCID record for XIAOLAN HU [Opens in a new window] ,
YUNQING ZHANG Open the ORCID record for YUNQING ZHANG [Opens in a new window]  and
YANBO ZHANG Open the ORCID record for YANBO ZHANG [Opens in a new window]
XIAOLAN HU
Affiliation:
School of Mathematics and Statistics, Central China Normal University, Wuhan 430079, PR China email xlhu@mail.ccnu.edu.cn
YUNQING ZHANG*
Affiliation:
Department of Mathematics, Nanjing University, Nanjing 210093, PR China email yunqingzh@nju.edu.cn
YANBO ZHANG
Affiliation:
College of Mathematics and Information Science, Hebei Normal University, Shijiazhuang 050024, PR China email ybzhang@163.com
*
✉yunqingzh@nju.edu.cn
Rights & Permissions [Opens in a new window]

Abstract

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For two given graphs $G_{1}$ and $G_{2}$, the planar Ramsey number $PR(G_{1},G_{2})$ is the smallest integer $N$ such that every planar graph $G$ on $N$ vertices either contains $G_{1}$, or its complement contains $G_{2}$. Let $C_{4}$ be a quadrilateral, $T_{n}$ a tree of order $n\geq 3$ with maximum degree $k$, and $K_{1,k}$ a star of order $k+1$. We show that $PR(C_{4},T_{n})=\max \{n+1,PR(C_{4},K_{1,k})\}$. Combining this with a result of Chen et al. [‘All quadrilateral-wheel planar Ramsey numbers’, Graphs Combin.33 (2017), 335–346] yields exact values of all the quadrilateral-tree planar Ramsey numbers.

Keywords

quadrilateraltreeplanar Ramsey number

MSC classification

Primary: 05C55: Generalized Ramsey theory
Type
Research Article
Information
Bulletin of the Australian Mathematical Society , Volume 97 , Issue 2 , April 2018 , pp. 194 - 199
Copyright
© 2018 Australian Mathematical Publishing Association Inc. 

Footnotes

The first author is partially supported by NSFC under grant number 11601176 and NSF of Hubei Province under grant number 2016CFB146; the second author is partially supported by NSFC under grant numbers 11671198 and 11571168; the third author is partially supported by NSFC under grant number 11601527.

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