Lankosz, Adam Polar-stereographic projection of space \(R^ 3\) on a plane. (Polish. English summary) Zbl 0856.51017 Opusc. Math. 16, 119-121 (1996). Summary: By means of the polarity principle with respect to a quadric and properties of stereographic projection of algebraic surfaces of 2nd order on a plane, certain method of projection are defined and described. In a particular case of the surface being rotational and centre of projection – an ombilic point, a circle in projection plane \(\Pi\) corresponds to a point of space \(\mathbb{R}^3\). Three theorems are also proved. On the ground of the theorems basic elements of space can be represented in the described method of projection. MSC: 51N15 Projective analytic geometry Keywords:polarity principle; stereographic projection PDFBibTeX XMLCite \textit{A. Lankosz}, Opusc. Math. 16, 119--121 (1996; Zbl 0856.51017)