A digraph is \emph{traceable} if it has a path that visits every vertex. A digraph $D$ is \emph{hypotraceable} if $D$ is not traceable but $D-v$ is traceable for every vertex $v\in V(D)$. It is known that there exists a planar hypotraceable digraph of order $n$ for every $n\geq 7$, but no examples of planar hypotraceable oriented graphs (digraphs without 2-cycles) have yet appeared in the literature. We show that there exists a planar hypotraceable oriented graph of order $n$ for every even $n \geq 10$, with the possible exception of $n = 14$.

Source : oai:HAL:hal-01218431v2

Volume: Vol 19 no. 1

Section: Graph Theory

Published on: March 16, 2017

Submitted on: February 17, 2017

Keywords: planar,hypohamiltonian,Hypotraceable,oriented graph,MSC 05C10, 05C20, 05C38,[MATH] Mathematics [math],[INFO.INFO-DM] Computer Science [cs]/Discrete Mathematics [cs.DM]

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