On a special class of Frobenius groups admitting planar partitions.
On a system of equations related to bicentric polygons.
On affine planes non-extensible to Laguerre planes and some related problems
Some examples of affine planes non-extensible to a Laguerre plane are studied and conditions for the uniqueness of a Laguerre extension are given.
On an application of the theorem of Apollonius
On an upper bound for the deviations from the mean value.
On analytic models of synthetic differential geometry
On Averaging Multisets.
On B. Segre's construction of an ovaloid
On Baer Subspaces of Finite Projective Spaces.
On Blocking Sets in Affine Hjelmslev Planes
ACM Computing Classification System (1998): G.2.1.We prove that the minimum size of an affine blocking set in the affine plane AHG ...This research has been supported by the Scientific Research Fund of Sofia University under Contract No 109/09.05.2012.
On Brocard points in the isotropic plane.
On Cameron-Liebler line classes.
On Certain Construction of Rhombic Hexecontahedra
On chirality groups and regular coverings of regular oriented hypermaps
We prove that if the Walsh bipartite map of a regular oriented hypermap is also orientably regular then both and have the same chirality group, the covering core of (the smallest regular map covering ) is the Walsh bipartite map of the covering core of and the closure cover of (the greatest regular map covered by ) is the Walsh bipartite map of the closure cover of . We apply these results to the family of toroidal chiral hypermaps induced by the family of toroidal bipartite maps...
On Collineation Groups of Finite Projective Spaces.
On collineation groups of translation planes of order .
On compression of Bruhat--Tits buildings.
On configuration of arguesian spaces
On configurations in 3-space without elementary planes and on the number of ordinary planes.
On continuous preservation of norms and areas.