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.
Parallel and nonparallel -structures on Euclidean spaces
Parallelbeleuchtung konvexer Körper mit glatten Rändern
Parallele Axonometrie und Einschneideverfahren
Parallelism in diagram geometry.
Parallelograms inscribed in a curve having a circle as π/2-isoptic
Jean-Marc Richard observed in [7] that maximal perimeter of a parallelogram inscribed in a given ellipse can be realized by a parallelogram with one vertex at any prescribed point of ellipse. Alain Connes and Don Zagier gave in [4] probably the most elementary proof of this property of ellipse. Another proof can be found in [1]. In this note we prove that closed, convex curves having circles as π/2-isoptics have the similar property.
Partial Geometries in Finite Affine Spaces.
Partial Ovoids and Partial Spreads of Classical Finite Polar Spaces
2000 Mathematics Subject Classification: 05B25, 51E20.We survey the main results on ovoids and spreads, large maximal partial ovoids and large maximal partial spreads, and on small maximal partial ovoids and small maximal partial spreads in classical finite polar spaces. We also discuss the main results on the spectrum problem on maximal partial ovoids and maximal partial spreads in classical finite polar spaces.The research of the fourth author was also supported by the Project Combined algorithmic...
Partial parallel classes in Steiner systems
Partial Spreads in Finite Projective Spaces and Partial Designs.
Partial Spreads, Packings and Hermitian Manifolds in PG (3, q).
Partitionen Liescher und algebraischer Gruppen.