Duality index of oriented regular hypermaps

Details Duality index of oriented regular hypermaps Duality index of oriented regular hypermaps

2011-01-25

arxiv.org/abs/1101.4814v1

Mathematics

Combinatorics

13 pages, 1 figure

Scientific paper

By adapting the notion of chirality group, the duality group of $\cal H$ can be defined as the the minimal subgroup $D({\cal H}) \trianglelefteq Mon({\cal H})$ such that ${\cal H}/D({\cal H})$ is a self-dual hypermap (a hypermap isomorphic to its dual). Here, we prove that for any positive integer $d$, we can find a hypermap of that duality index (the order of $D({\cal H})$), even when some restrictions apply, and also that, for any positive integer $k$, we can find a non self-dual hypermap such that $|Mon({\cal H})|/d=k$. This $k$ will be called the \emph{duality coindex} of the hypermap.

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