Górska, Renata A. Accolineation in the \(P\)-projection. (English) Zbl 1188.51012 G, Slov. Čas. Geom. Graf. 6, No. 11, 5-12 (2009). Let \(S\) and \(N\) be two opposite points of a sphere \(\Phi\). The plane \(\pi\) is tangent to \(\Phi\) in the point \(S\). A \(P\)-projection is the superposition of a central projection onto \(\Phi\) from \(S\) and a stereographic projection onto \(\pi\) from \(N\). It is discussed general and specific properties of the \(P\)-projection. It is given the tranformation of an arbitrary circle into a parabola. The paper is dedicated to Professor Marian Palej. Reviewer: Agota H. Temesvári (Sopron) MSC: 51N05 Descriptive geometry 51M35 Synthetic treatment of fundamental manifolds in projective geometries (Grassmannians, Veronesians and their generalizations) 51M15 Geometric constructions in real or complex geometry Keywords:central and stereographic projection; accolineation PDFBibTeX XMLCite \textit{R. A. Górska}, G, Slov. Čas. Geom. Graf. 6, No. 11, 5--12 (2009; Zbl 1188.51012)