no. 2
Stationary map coloring
Annales de l'I.H.P. Probabilités et statistiques, Tome 48 (2012) no. 2, pp. 327-342.

Nous étudions un processus de Poisson planaire et sa partition de Voronoi associée. Nous montrons qu'il existe une coloration à six couleurs de cette partition satisfaisant les deux propriétés suivantes : la coloration est une fonction déterministe du processus de Poisson. Par ailleurs, elle commute avec les isométries du plan. Une partie de la preuve consiste à montrer que le “6-core” de la triangulation de Delaunay associée est vide. Des généralisations, extensions et problèmes ouverts sont discutés.

We consider a planar Poisson process and its associated Voronoi map. We show that there is a proper coloring with 6 colors of the map which is a deterministic isometry-equivariant function of the Poisson process. As part of the proof we show that the 6-core of the corresponding Delaunay triangulation is empty. Generalizations, extensions and some open questions are discussed.

DOI : 10.1214/10-AIHP399
Classification : 60C05, 60D05
Mots clés : Poisson process, graph coloring, planar graphs, Voronoi tessellation, Delaunay triangulation, percolation 
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     title = {Stationary map coloring},
     journal = {Annales de l'I.H.P. Probabilit\'es et statistiques},
     pages = {327--342},
     publisher = {Gauthier-Villars},
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Angel, Omer; Benjamini, Itai; Gurel-Gurevich, Ori; Meyerovitch, Tom; Peled, Ron. Stationary map coloring. Annales de l'I.H.P. Probabilités et statistiques, Tome 48 (2012) no. 2, pp. 327-342. doi : 10.1214/10-AIHP399. http://www.numdam.org/articles/10.1214/10-AIHP399/

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