= P. D. Seymour
{c}
P. D. Seymour studied square-lattice <bond percolation> with <D. J. A. Welsh>. Their work constructs crossing bounds for rectangles from square-crossing information, using positive correlation and geometric combinations of crossing events. Such scale comparisons are central to <Russo-Seymour-Welsh theorem> and planar critical connectivity.<Percolation probabilities on the square lattice by P. D. Seymour and D. J. A. Welsh>[Introduction and Sections 4–5]{ref}
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