Geodesic
Planar Lattices
Canadian journal of mathematics, Tome 27 (1975) no. 3, pp. 636-665

Voir la notice de l'article provenant de la source Cambridge University Press

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. 
Kelly, David; Rival, Ivan. Planar Lattices. Canadian journal of mathematics, Tome 27 (1975) no. 3, pp. 636-665. doi: 10.4153/CJM-1975-074-0
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