Mathematics > Combinatorics
[Submitted on 18 Sep 2023 (v1), last revised 1 May 2024 (this version, v2)]
Title:A sufficient condition for cubic 3-connected plane bipartite graphs to be hamiltonian
View PDF HTML (experimental)Abstract:Barnette's conjecture asserts that every cubic $3$-connected plane bipartite graph is hamiltonian. Although, in general, the problem is still open, some partial results are known. In particular, let us call a face of a plane graph big (small) if it has at least six edges (it has four edges, respectively). Goodey proved for a $3$-connected bipartite cubic plane graph $P$, that if all big faces in $P$ have exactly six edges, then $P$ is hamiltonian. In this paper we prove that the same is true under the condition that no face in $P$ has more than four big neighbours. We also prove, that if each vertex in $P$ is incident both with a small and a big face, then~$P$ has at least $2^{k}$ different Hamilton cycles, where $k = \left\lceil\frac{|B|-2}{4\Delta(B) - 7}\right\rceil$, $|B|$ is the number of big faces in $P$ and $\Delta(B)$ is the maximum size of faces in $P$. 15 pages
Submission history
From: Jan Florek [view email][v1] Mon, 18 Sep 2023 08:39:04 UTC (16 KB)
[v2] Wed, 1 May 2024 11:01:29 UTC (16 KB)
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