Planar Lattices
, and .
27 (3): 636-665-- (1975)

A finite partially ordered set (poset) P is customarily represented by drawing a small circle for each point, with a lower than b whenever a < b in P, and drawing a straight line segment from a to b whenever a is covered by b in P (see, for example, G. Birkhoff 2, p. 4). A poset P is planar if such a diagram can be drawn for P in which none of the straight line segments intersect.
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