Skip to Main content Skip to Navigation
Theses

Etude d’une nouvelle classe de graphes : les graphes hypotriangulés

Abstract : In this thesis, we define a new class of graphs : the hypochordal graphs. These graphs satisfy that for any path of length two, there exists a chord or another path of length two between its two endpoints. This class can represent robust networks. Indeed, we show that in such graphs, in the case of an edge or a vertex deletion, the distance beween any pair of nonadjacent vertices remains unchanged. Then, we study several properties for this class of graphs. Especially, after introducing a family of specific partitions, we show the relations between some of these partitions and hypochordality. Moreover, thanks to these partitions, we characterise minimum hypochordal graph, that are, among connected hypochordal graphs, those that minimise the number of edges for a given number of vertices. In a second part, we study the complexity, for hypochordal graphs, of problems that are NP-hard in the general case. We first show that the classical problems of hamiltonian cycle, colouring, maximum clique and maximum stable set remain NP-hard for this class of graphs. Then, we analyse graph modification problems : deciding the minimal number of edges to add or delete from a graph, in order to obtain an hypochordal graph. We study the complexity of these problems for sevaral classes of graphs.
Complete list of metadatas

Cited literature [36 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00686960
Contributor : Abes Star :  Contact
Submitted on : Wednesday, April 11, 2012 - 5:22:43 PM
Last modification on : Saturday, December 21, 2019 - 3:45:47 AM
Long-term archiving on: : Thursday, July 12, 2012 - 10:00:34 AM

File

these_TOPART.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-00686960, version 1

Collections

Citation

Hélène Topart. Etude d’une nouvelle classe de graphes : les graphes hypotriangulés. Réseaux et télécommunications [cs.NI]. Conservatoire national des arts et metiers - CNAM, 2011. Français. ⟨NNT : 2011CNAM0776⟩. ⟨tel-00686960⟩

Share

Metrics

Record views

587

Files downloads

4789