Orthogonalitätsrelationen mit Paralleleninvarianz und Zentralbündel von Schrägspiegelungen an Ebenen im äquiaffinen Raum
Orthogonality as single primitive notion for metric planes.
Osculatory behavior and second dual varieties of Del Pezzo surfaces.
Ovali ed altre curve nei piani di Galois di caratteristica due
Ovals and non-ovoidal Laguerre planes.
Ovoids of the Hermitian surface in odd characteristic.
and line-transitive linear spaces.
(3) as a symmetric (36, 15, 6)-design
Paare und Tripel halbkonzentrischer Kreise der euklidischen Ebene.
Packing graphs: The packing problem solved.
Packing lines, planes, etc.: Packings in Grassmannian spaces.
Pairs of convex bodies in a hyperspace over a Minkowski two-dimensional space joined by a unique metric segment
Let be a Minkowski space with a unit ball and let be the Hausdorff metric induced by in the hyperspace of convex bodies (nonempty, compact, convex subsets of ℝ). R. Schneider [RSP] characterized pairs of elements of which can be joined by unique metric segments with respect to for the Euclidean unit ball Bⁿ. We extend Schneider’s theorem to the hyperspace over any two-dimensional Minkowski space.
Pappus' theorem for ring-geometries.
Pappus's theorem and the modular group
Parabeln mit gemeinsamen isotropem Krümmungskreis.
"Paradoxe" Zerlegung Euklidischer Räume.
Parallel and nonparallel -structures on Euclidean spaces
Parallelbeleuchtung konvexer Körper mit glatten Rändern
Parallele Axonometrie und Einschneideverfahren
Parallelism in diagram geometry.