Planar graphs with the maximum number of induced 6-cycles

For large \(n\) we determine the maximum number of induced 6-cycles which can be contained in a planar graph on \(n\) vertices, and we classify the graphs which achieve this maximum. In particular we show that the maximum is achieved by the graph obtained by blowing up three pairwise non-adjacent ve...

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Bibliographic Details
Published inarXiv.org
Main Author Savery, Michael
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 22.01.2024
Subjects
Apexes
Graph theory
Graphs
Mathematics - Combinatorics
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Summary:For large \(n\) we determine the maximum number of induced 6-cycles which can be contained in a planar graph on \(n\) vertices, and we classify the graphs which achieve this maximum. In particular we show that the maximum is achieved by the graph obtained by blowing up three pairwise non-adjacent vertices in a 6-cycle to sets of as even size as possible, and that every extremal example closely resembles this graph. This extends previous work by the author which solves the problem for 4-cycles and 5-cycles. The 5-cycle problem was also solved independently by Ghosh, Győri, Janzer, Paulos, Salia, and Zamora.
ISSN:2331-8422
DOI:10.48550/arxiv.2110.07319