= P. W. Kasteleyn
{c}
P. W. Kasteleyn coauthored the <FKG inequality> with <C. M. Fortuin> and <J. Ginibre>. Their theorem gives positive association for increasing functions on a finite <distributive lattice> when the probability weights satisfy the required lattice condition. It provides a rigorous correlation tool for <Ising models> and the <random-cluster model>.<Correlation inequalities on some partially ordered sets by C. M. Fortuin and others>[Publisher abstract]{ref}
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