Cominkowskische und absolute Geometrie. (Cominkowskian and absolute geometry) (Q1822356)

Given a cone Q and a point P exterior to Q in the real projective three- space, the so called cominkowskian (according to the terminology of I. M. Yaglom) geometry G may be obtained e.g. by assuming the lines on P, containing two distinct points of Q, and the planes on P, containing a non-degenerate conic of Q, as points and lines of G respectively. The authors study many properties and the motion group of G by means of different models of G.