Abstract
AbstractThe cycle spectrum of a graph is the set of the cycle lengths in . Let be a graph class. For any integer , define to be the least integer such that for any with circumference at least . Denote by , and the classes of 3‐connected planar graphs, 3‐connected cubic planar graphs, 3‐connected claw‐free planar graphs, and 3‐connected claw‐free cubic planar graphs, respectively. The values of and were known for all . In the first part of this article, we prove the claw‐free version of these results by giving the values of and for all . In the second part we study the cycle spectra of 4‐connected planar graphs without 4‐cycles. Bondy conjectured that every 4‐connected planar graph has all cycle lengths from 3 to except possibly one even length. The truth of this conjecture would imply that every 4‐connected planar graph without 4‐cycles has all cycle lengths other than 4. It was already known that . We prove that can be embedded in the plane such that for any has a ‐cycle and all vertices not in lie in the exterior of .
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
