Erdős-Hajnal for cap-free graphs
Erdős-Hajnal for cap-free graphs
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ErdÅs-Hajnal 用于无上限图
DOI:
10.1016/j.jctb.2021.07.006
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Seymour, Paul
中科院分区:
文献类型:
--
作者:
Chudnovsky, Maria;Seymour, Paul
A “cap” in a graph G is an induced subgraph of G that consists of a cycle of length at least four, together with one further vertex that has exactly two neighbours in the cycle, adjacent to each other, and the “house” is the smallest, on five vertices. It is not known whether there exists ε> 0 such that every graph G containing no house has a clique or stable set of cardinality at least| G| ε; this is the smallest open case of the Erdős-Hajnal conjecture and has been the subject of much study. We prove that there exists ε> 0 such that every graph G with no cap has a clique or stable set of cardinality at least| G| ε.
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Journal of combinatorial theory. Series B (Print)
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影响因子:
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