On flag-transitive anomalous -geometries.
On the automorphism group of planes of Figueroa type
Opérations sur les cartes et métamorphoses de la catégorie des G-ensembles.
We call metamorphosis of a given category an autoequivalence functor up to within natural equivalence. We show that, given a group G, the group of metamorphoses of the category of G-sets (as well as the corresponding group for ?sufficiently big? subcategories) may be naturally identified to the group of outer automorphism of G. We get by this way a natural description of a group of known operations on tessellations of a surface: the identity operation, the Poincaré duality, and four others which...
and line-transitive linear spaces.
Pappus' theorem for ring-geometries.
Projective collineations as products of homologies, elations, and projective reflections. (Short Communication).
Projective collineations as products of homologies, elations, and projective reflections.
Projective geometry for orthogonal groups.
Projektive Ebenen mit Homomorphismus und erweiterte lokale Ternärringe
Quasi-Perspectivities in Stable Planes.
Real analytic projective planes with large automorphism groups.
Regular hexagons in normed spaces and a theorem of Walter Benz.
Replaceable nets and improper collineations
Sur l'existence d'espaces affinés à groupes de translations non commutatifs
The degrees of certain strata of the dual variety
Two theorems on homomorphism of projective nets
Zu den Automorphismen der Laguerreschen Bewegungen
Автоморфизмы - сетей
Гомоморфизмы и алгоритмические проблемы в проективных плоскостях.
О гомоморфизмах проективных плоскостей. I