Negative association in uniform forests and connected graphs
Abstract
We consider three probability measures on subsets of edges of a given finite graph , namely those which govern, respectively, a uniform forest, a uniform spanning tree, and a uniform connected subgraph. A conjecture concerning the negative association of two edges is reviewed for a uniform forest, and a related conjecture is posed for a uniform connected subgraph. The former conjecture is verified numerically for all graphs having eight or fewer vertices, or having nine vertices and no more than eighteen edges, using a certain computer algorithm which is summarised in this paper. Negative association is known already to be valid for a uniform spanning tree. The three cases of uniform forest, uniform spanning tree, and uniform connected subgraph are special cases of a more general conjecture arising from the random-cluster model of statistical mechanics.
Keywords
Cite
@article{arxiv.math/0302185,
title = {Negative association in uniform forests and connected graphs},
author = {G. R. Grimmett and S. N. Winkler},
journal= {arXiv preprint arXiv:math/0302185},
year = {2007}
}
Comments
With minor corrections