Graphs and topologies on discrete sets
✍ Scribed by Pascal Préa
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 597 KB
- Volume
- 103
- Category
- Article
- ISSN
- 0012-365X
No coin nor oath required. For personal study only.
✦ Synopsis
PrCa, P., Graphs and topologies on discrete sets, Discrete Mathematics 103 (1992) 189-197.
We show that a graph admits a topology on its node set which is compatible with the usual connectivity of undirected graphs if, and only if, it is a comparability graph. Then, we give a similar condition for the weak connectivity of oriented graphs and show there is no topology which is compatible with the strong connectivity of oriented graphs. We also give a necessary and sufficient condition for a topology on a discrete set to be 'representable' by an undirected graph.
R&sum6
Nous montrons qu'un graphe admet une topologie sur I'ensemble de ses sommets compatible avec la connexit6 usuelle des graphes non-orient& si, et settlement si c'est un graphe de comparabilitt; puis nous donnons une condition similaire pour la connexite faible des graphes orient& et montrons la non-existence d'une topologie compatible avec la connexite forte. Nous donnons Cgalement une condition necessaire et suffisante pour qu'une topologie sur un ensemble discret soit 'representable' par un graphe non-oriente.
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