cotriangular space

A cotriangular space is a http://planetmath.org/node/PartialLinearSpacepartial linear space $(P,L)$ in which

• each line contains exactly three points, and

• given a point not on a line, the point is collinear with zero or two points of the line.

Title cotriangular space CotriangularSpace 2013-03-22 17:15:34 2013-03-22 17:15:34 pan (17366) pan (17366) 9 pan (17366) Definition msc 51A05