A Helmholtz-Lie Type Characterization of Ellipsoids, I .
A non-Desarguesian space geometry
A Note of Affine Planes with Transitive Collineation Groups.
A relation between the numbers of singular points and singular lines of a plane closed curve.
Affine and projective generalization of Wallace lines.
Affine Hjelmslev-Ebenen mit verfeinerten Nachbarschaftsrelationen.
Affine regular icosahedron circumscribed around the affine regular octahedron in GS--quasigroup
The concept of the affine regular icosahedron and affine regular octahedron in a general GS-quasigroup will be introduced in this paper. The theorem of the unique determination of the affine regular icosahedron by means of its four vertices which satisfy certain conditions will be proved. The connection between affine regular icosahedron and affine regular octahedron in a general GS-quasigroup will be researched. The geometrical representation of the introduced concepts and relations between them...
Affininvariante Strahlreflexion an ebenen Kurven
Algebraische Geometrien
Analytický důkaz spůsobu, jakým lze sestrojiti normálu k ellipse
Angeordnete affine Ebenen als Ebenen mit einem System von Halbgeraden, und euklidische Ebenen, die genau eine Anordnung besitzen.
Ansätze für einen intervallmathematischen bzw. logisch dreiwertigen Aufbau der analytischen Geometrie
Applications Lineaires Affines Multivoques