On the Circumference of Essentially 4-connected Planar Graphs
Journal of Graph Algorithms and Applications, Tome 24 (2020) no. 1, pp. 21-46.

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A planar graph is essentially 4-connected if it is 3-connected and every of its 3-separators is the neighborhood of a single vertex. Jackson and Wormald proved that every essentially 4-connected planar graph G on n vertices contains a cycle of length at least 2n+45, and this result has recently been improved multiple times. In this paper, we prove that every essentially 4-connected planar graph G on n vertices contains a cycle of length at least 58(n+2). This improves the previously best-known lower bound 35(n+2).
DOI : 10.7155/jgaa.00516
Mots-clés : Circumference, Essentially 4-Connected Planar Graphs, Longest Cycle, Discharging, Tutte Cycle
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Igor Fabrici; Jochen Harant; Samuel Mohr; Jens Schmidt. On the Circumference of Essentially 4-connected Planar Graphs. Journal of Graph Algorithms and Applications, Tome 24 (2020) no. 1, pp. 21-46. doi : 10.7155/jgaa.00516. https://geodesic-test.mathdoc.fr/articles/10.7155/jgaa.00516/

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