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2016 | OriginalPaper | Buchkapitel

Convex Independence in Permutation Graphs

verfasst von : Wing-Kai Hon, Ton Kloks, Fu-Hong Liu, Hsiang-Hsuan Liu

Erschienen in: Combinatorial Optimization and Applications

Verlag: Springer International Publishing

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Abstract

A set C of vertices of a graph is \(P_3\)-convex if every vertex outside C has at most one neighbor in C. The convex hull \(\sigma (A)\) of a set A is the smallest \(P_3\)-convex set that contains A. A set M is convexly independent if for every vertex \(x \in M\), \(x \notin \sigma (M-x)\). We show that the maximal number of vertices that a convexly independent set in a permutation graph can have, can be computed in polynomial time. (Due to space limit, the missing proofs are presented in the full paper. Please see https://​drive.​google.​com/​file/​d/​0B1Ilu0-p1dDsSkpsZFZsR1Y​4Uk0/​view or http://​arxiv.​org/​abs/​1609.​02657).

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Fußnoten
1
In his classic paper, Duchet defines a graph convexity as a collection of ‘convex’ subsets of a (finite) set V that contains \(\varnothing \) and V, and that is closed under intersections, and that, furthermore, has the property that each convex subset induces a connected subgraph. This last condition is, here, omitted.
 
2
Ramos et al. call it the ‘rank’ of the graph, but this word has been used for so many different concepts that it has lost all meaning.
 
3
Duchet proved that, for interval convexities, the Carathéodory number is the smallest integer \(k \in \mathbb {N}\) such that every \((k+1)\)-set is redundant. Thus, the fixed-parameter Carathéodory number is polynomial.
 
Literatur
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Metadaten
Titel
Convex Independence in Permutation Graphs
verfasst von
Wing-Kai Hon
Ton Kloks
Fu-Hong Liu
Hsiang-Hsuan Liu
Copyright-Jahr
2016
DOI
https://doi.org/10.1007/978-3-319-48749-6_52