- projectively related ranges
- проективно связанные линейные ряды
English-Russian scientific dictionary. 2008.
English-Russian scientific dictionary. 2008.
Oval (projective plane) — In mathematics, an oval in a projective plane is a set of points, no three collinear, such that there is a unique tangent line at each point (a tangent line is defined as a line meeting the point set at only one point, also known as a 1 secant).… … Wikipedia