-Bewegungen mit den -Automorphismen
-biregular rings
-axonometries and the contour of hyperspheres.
-Amalgams IV
-Amalgams V
-Amalgams VI
-Amalgams VII
100 let „Základů geometrie‟: Rozhodující příspěvek Davida Hilberta k formalizaci matematiky
16-dimensional compact projective planes with 3 fixed points.
1-Dimensional Orbits in Flat Projective Planes.
designs obtained from affine planes
The simple incidence structure formed by points and unordered pairs of distinct parallel lines of a finite affine plane of order is a design. If , is the complementary design of . If , is isomorphic to the geometric design (see [2; Theorem 1.2]). In this paper we give necessary and sufficient conditions for a design to be of the form for some finite affine plane of order . As a consequence we obtain a characterization of small designs .
24 self-inscribed decagons in Desargues configuration
2-blocking sets in PG(4, ), square.
2-frieze patterns and the cluster structure of the space of polygons
We study 2-frieze patterns generalizing that of the classical Coxeter-Conway frieze patterns. The geometric realization of this space is the space of -gons (in the projective plane and in 3-dimensional vector space) which is a close relative of the moduli space of genus curves with marked points. We show that the space of 2-frieze patterns is a cluster manifold and study its algebraic and arithmetic properties.
2-manifold surfaces and space partitions
2-transitiv abstract ovals of odd order.
3D illustrations to Chapter 8 of Cromwell's Polyhedra
4-dimensional Minkowski planes with large automorphism group.
4-dimensionale Translationsebenen.
4-dimensionale Translationsebenen mit 7-dimensionaler Kollineationsgruppe.