Real analytic projective planes with large automorphism groups.
Real equivalence of complex matrix pencils and complex projections of real Segre varieties.
Realizations of regular apeirotopes.
Realizations of regular polytopes.
Receding polar regions of a spherical building and the center conjecture
We introduce the notion of a polar region of a spherical building and use some simple observations about polar regions to give elementary proofs of various fundamental properties of root groups. We combine some of these observations with results of Timmesfeld, Balser and Lytchak to give a new proof of the center conjecture for convex chamber subcomplexes of thick spherical buildings.
Recherche des graphes des matrices de Coxeter hyperboliques d’ordre
Recherche des sections circulaires des quadriques.
Recherche des singularités qui ont rapport à une droite multiple d'une surface
Recherches analytiques sur la surface du troisième ordre qui est la réciproque de la surface de Steiner
Recherches sur les normales que l'on peut, d'un point donné mener à une conique
Reciprocal domains and Cohen-Macaulay -complexes in .
Réciproque d'une proposition sur les coniques homothétiques qui ont le même centre
Reconstructing Plane Sets from Projections.
Recursive constructions for skew resolutions in affine geometries.
Reduction Theory for Fuchsian Groups.
Reflection curves -- new computation and rendering techniques.
Reflection loops of spaces with congruence and hyperbolic incidence structure
In an absolute space with congruence there are line reflections and point reflections. With the help of point reflections one can define in a natural way an addition + of points which is only associative if the product of three point reflection is a point reflection again. In general, for example for the case that is a linear space with hyperbolic incidence structure, the addition is not associative. is a K-loop or a Bruck loop.
Reflections on refractions.
Reflections on spheres and cylinders of revolution.
Regular conditional linear spaces with two consecutive line degrees.