Abstract
Motivated by the long-standing and wide open pancyclicity conjectures of Bondy and Malkevitch, we study the cycle spectra of contraction-critically 4-connected planar graphs. We show that every contraction-critically 4-connected planar graph on n vertices contains a cycle of length k for every \(k \in \big \{\lfloor \frac{n}{2} \rfloor - \lceil \frac{n}{108} \rceil , \dots , \lfloor \frac{n}{2} \rfloor + \lfloor \frac{n}{36} \rfloor \big \} \cup \big \{\frac{2}{3} n, \dots , n\big \}\).
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Notes
A square of a cycle is obtained from the cycle by joining each pair of vertices at distance two with an edge.
A graph G is cyclically 4-edge-connected if, for every edge-cut S of G with less than 4 edges, \(G - S\) has a component that contains no cycle.
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Acknowledgements
The authors would like to thank three anonymous referees for their careful reading and helpful comments which greatly improved the presentation of this paper; and to thank Matthias Kriesell and Tomáš Madaras for bringing our attention to this research problem and for inspiring discussions.
Funding
On-Hei Solomon Lo’s research was partially supported by NSFC Grants 11971406 and 11622110. Jens M. Schmidt’s research was partially supported by the Grant SCHM 3186/2-1 (401348462) from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation).
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Lo, OH.S., Schmidt, J.M. Cycle Spectra of Contraction-Critically 4-Connected Planar Graphs. Graphs and Combinatorics 37, 2129–2137 (2021). https://doi.org/10.1007/s00373-021-02358-x
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DOI: https://doi.org/10.1007/s00373-021-02358-x