Geodesic
Crooked planes
Electronic research announcements of the American Mathematical Society, Tome 01 (1995) no. 1, pp. 10-17.

Voir la notice de l'article provenant de la source American Mathematical Society

Crooked planes are polyhedra used to construct fundamental polyhedra for discrete groups of Lorentz isometries acting properly on Minkowski (2+1)-space. These fundamental polyhedra are regions bounded by disjoint crooked planes. We develop criteria for the intersection of crooked planes and apply these criteria to proper discontinuity of discrete isometry groups. 
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Drumm, Todd; Goldman, William. Crooked planes. Electronic research announcements of the American Mathematical Society, Tome 01 (1995) no. 1, pp. 10-17. doi : 10.1090/S1079-6762-95-01002-X. http://geodesic.mathdoc.fr/articles/10.1090/S1079-6762-95-01002-X/

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