Electronic Journal of Probability

Finitely dependent insertion processes

Avi Levy

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A $q$-coloring of $\mathbb Z$ is a random process assigning one of $q$ colors to each integer in such a way that consecutive integers receive distinct colors. A process is $k$-dependent if any two sets of integers separated by a distance greater than $k$ receive independent colorings. Holroyd and Liggett constructed the first stationary $k$-dependent $q$-colorings by introducing an insertion algorithm on the complete graph $K_q$. We extend their construction from complete graphs to weighted directed graphs. We show that complete multipartite analogues of $K_3$ and $K_4$ are the only graphs whose insertion process is finitely dependent and whose insertion algorithm is consistent. In particular, there are no other such graphs among all unweighted graphs and among all loopless complete weighted directed graphs. Similar results hold if the consistency condition is weakened to eventual consistency. Finally we show that the directed de Bruijn graphs of shifts of finite type do not yield $k$-dependent insertion processes, assuming eventual consistency.

Article information

Electron. J. Probab., Volume 22 (2017), paper no. 32, 19 pp.

Received: 3 April 2016
Accepted: 1 February 2017
First available in Project Euclid: 12 April 2017

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Mathematical Reviews number (MathSciNet)

Zentralblatt MATH identifier

Primary: 60G10: Stationary processes 05C15: Coloring of graphs and hypergraphs 60C05: Combinatorial probability

proper coloring directed graph weighted graph m-dependence stationary process shift of finite type

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Levy, Avi. Finitely dependent insertion processes. Electron. J. Probab. 22 (2017), paper no. 32, 19 pp. doi:10.1214/17-EJP35. https://projecteuclid.org/euclid.ejp/1491962643

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