Geodesic
Pascal Ovals in Projective Planes
Canadian journal of mathematics, Tome 21 (1969) no. 1, pp. 1462-1476

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

A projective plane consists of a set of points and a set of lines, together with a relation of incidence between points and lines, such that(i) any two distinct points P, Q are incident with a unique line PQ,(ii) any two distinct lines p, q are incident with a unique point p ∩ q,(iii) there exist four points, no three of which are incident with the same line.We shall use the usual geometrical terminology.An oval in a projective plane π is a set of points of π such that:(i) no three points of are collinear; this means that a line of π is either a secant of , containing two points of , or a tangent of , containing just one point of , or a non-secant of , containing no point of ; 
Rigby, J. F. Pascal Ovals in Projective Planes. Canadian journal of mathematics, Tome 21 (1969) no. 1, pp. 1462-1476. doi: 10.4153/CJM-1969-160-4
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