QUADRILATERAL-TREE PLANAR RAMSEY NUMBERS
QUADRILATERAL-TREE PLANAR RAMSEY NUMBERS
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四边形树平面 Ramsey 数
DOI:
10.1017/s0004972717001022
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发表时间:
2018-01
影响因子:
0.7
通讯作者:
Zhang Yanbo
中科院分区:
文献类型:
--
作者:
Hu Xiaolan;Zhang Yunqing;Zhang Yanbo
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.
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10.1006/jctb.1993.1070
发表时间:
1993-11
期刊:
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影响因子:
--
作者:
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通讯作者:
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DOI:
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1988
期刊:
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影响因子:
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通讯作者:
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DOI:
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发表时间:
2005
期刊:
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影响因子:
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作者:
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通讯作者:
Izolda Gorgol
影响因子:
1
作者:
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通讯作者:
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影响因子:
0.8
作者:
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通讯作者:
Cheng T. C. Edwin