On the Tetrahedroid as a particular case of the 16-nodal quartic surface.
On the theorems of central axonometry.
On the theorems of Drake and Lenz.
On the upper and lower chromatic numbers of BSQSs(16).
On the upward motion of a double cone on an inclined plane.
On the volume of a symmetric tetrahedron in hyperbolic and spherical spaces.
On the volume of hyperbolic polyhedra.
On the volume of unbounded polyhedra in the hyperbolic space.
On the volumes of hyperbolic 5-orthoschemes and the Trilogarithm.
On topological Tits buildings and their classification
On universal groups and three-manifolds.
On Veldkamp lines.
On volumes of arithmetic quotients of
We apply G. Prasad’s volume formula for the arithmetic quotients of semi-simple groups and Bruhat-Tits theory to study the covolumes of arithmetic subgroups of . As a result we prove that for any even dimension there exists a unique compact arithmetic hyperbolic -orbifold of the smallest volume. We give a formula for the Euler-Poincaré characteristic of the orbifolds and present an explicit description of their fundamental groups as the stabilizers of certain lattices in quadratic spaces. We...
On -distance in three dimensional space.
On -distance in -dimensional space.
One characterization of special translation planes
One configurational characterization of Ostrom nets
Bz the quadrileteral condition in a given net there is meant the following implication: If are arbitrary points, no three of them lie on the same line, with coll (collinearity) for any five from six couples then there follows the collinearity coll for the remaining couple . In the article there is proved the every net satisfying the preceding configuration condition is necessarity the Ostrom net (i.e., the net over a field). Conversely, every Ostrom net satisfies the above configuration...
One generalization of planar partitions of Abelian groups
One generalization of quasifield
One generalization of the fourth harmonic point (Preliminary communication)