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ON THE CROSSING NUMBER OF THE CARTESIAN PRODUCT OF A SUNLET GRAPH AND A STAR GRAPH

Part of: Graph theory Discrete mathematics in relation to computer science

Published online by Cambridge University Press:  08 February 2019

MICHAEL HAYTHORPE Open the ORCID record for MICHAEL HAYTHORPE [Opens in a new window]  and
ALEX NEWCOMBE Open the ORCID record for ALEX NEWCOMBE [Opens in a new window]
MICHAEL HAYTHORPE*
Affiliation:
1284 South Road, Clovelly Park, 5042, College of Science and Engineering, Flinders University, Australia email [email protected]
ALEX NEWCOMBE
Affiliation:
1284 South Road, Clovelly Park, 5042, College of Science and Engineering, Flinders University, Australia email [email protected]
*
✉[email protected]
Rights & Permissions [Opens in a new window]

Abstract

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The exact crossing number is only known for a small number of families of graphs. Many of the families for which crossing numbers have been determined correspond to cartesian products of two graphs. Here, the cartesian product of the sunlet graph, denoted ${\mathcal{S}}_{n}$, and the star graph, denoted $K_{1,m}$, is considered for the first time. It is proved that the crossing number of ${\mathcal{S}}_{n}\Box K_{1,2}$ is $n$, and the crossing number of ${\mathcal{S}}_{n}\Box K_{1,3}$ is $3n$. An upper bound for the crossing number of ${\mathcal{S}}_{n}\Box K_{1,m}$ is also given.

Keywords

crossing numbercartesian productstarsunlet graph

MSC classification

Primary: 05C10: Planar graphs; geometric and topological aspects of graph theory
Secondary: 68R10: Graph theory (including graph drawing)
Type
Research Article
Information
Bulletin of the Australian Mathematical Society , Volume 100 , Issue 1 , August 2019 , pp. 5 - 12
Copyright
© 2019 Australian Mathematical Publishing Association Inc. 

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