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New dualities from old: generating geometric, Petrie, and Wilson dualities and trialities of ribbon graphs

Part of: Graph theory Low-dimensional topology

Published online by Cambridge University Press:  07 October 2021

Lowell Abrams  and
Joanna A. Ellis-Monaghan
Lowell Abrams*
Affiliation:
University Writing Program and Department of Mathematics, George Washington University, 2115 G Street NW, Washington, DC 20052, USA
Joanna A. Ellis-Monaghan
Affiliation:
Korteweg-de Vries Institute for Mathematics, University of Amsterdam, Science Park 105-107, 1098XG Amsterdam, The Netherlands
*
*Corresponding author. Email: labrams@gwu.edu
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Abstract

We define a new ribbon group action on ribbon graphs that uses a semidirect product of a permutation group and the original ribbon group of Ellis-Monaghan and Moffatt to take (partial) twists and duals, or twuals, of ribbon graphs. A ribbon graph is a fixed point of this new ribbon group action if and only if it is isomorphic to one of its (partial) twuals. This extends the original ribbon group action, which only used the canonical identification of edges, to the more natural setting of self-twuality up to isomorphism. We then show that every ribbon graph has in its orbit an orientable embedded bouquet and prove that the (partial) twuality properties of these bouquets propagate through their orbits. Thus, we can determine (partial) twualities via these one vertex graphs, for which checking isomorphism reduces simply to checking dihedral group symmetries. Finally, we apply the new ribbon group action to generate all self-trial ribbon graphs on up to seven edges, in contrast with the few, large, very high-genus, self-trial regular maps found by Wilson, and by Jones and Poultin. We also show how the automorphism group of a ribbon graph yields self-dual, -petrial or –trial graphs in its orbit, and produce an infinite family of self-trial graphs that do not arise as covers or parallel connections of regular maps, thus answering a question of Jones and Poulton.

Keywords

Embedded graphribbon graphdualityPetrie dualitytrialitytwualityregular mapWilson grouptwistpartial dual

MSC classification

Primary: 05C10: Planar graphs; geometric and topological aspects of graph theory
Secondary: 05C25: Graphs and abstract algebra (groups, rings, fields, etc.) 57M15: Relations with graph theory
Type
Paper
Information
Combinatorics, Probability and Computing , Volume 31 , Issue 4 , July 2022 , pp. 574 - 597
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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