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The RSW theorem for continuum percolation and the CLT for Euclidean minimal spanning trees. (English) Zbl 0855.60009
Summary: We prove a central limit theorem for the length of the minimal spanning tree of the set of sites of a Poisson process of intensity $$\lambda$$ in $$[0,1]^2$$ as $$\lambda \to \infty$$. As observed previously by Ramey, the main difficulty is the dependency between the contributions to this length from different regions of $$[0,1]^2$$; a percolation-theoretic result on circuits surrounding a fixed site can be used to control this dependency. We prove such a result via a continuum percolation version of the Russo-Seymour-Welsh theorem for occupied crossings of a rectangle. This RSW theorem also yields a variety of results for two-dimensional fixed-radius continuum percolation already well known for lattice models, including a finite-box criterion for percolation and absence of percolation at the critical point.

##### MSC:
 60D05 Geometric probability and stochastic geometry 60K35 Interacting random processes; statistical mechanics type models; percolation theory 90C27 Combinatorial optimization 60F05 Central limit and other weak theorems
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##### References:
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