types of configurations of flexes and sextactic points of a cubic
A Geometric Characterization of Moufang Hexagons.
A Resolution of the Sylvester-Gallai Problem of J.-P. Serre.
A survey of Sylvester's problem and its generalizations.
Affinspiegelungen in affinen Räumen einer beliebigen Dimension ... 2
Ceva-Dreiecke.
Configuration conditions of small point rank in 3-nets
Das Problem der räumlichen Projectivität
Degree of triangle centers and a generalization of the Euler line.
Discrete Laplace cycles of period four
We study discrete conjugate nets whose Laplace sequence is of period four. Corresponding points of opposite nets in this cyclic sequence have equal osculating planes in different net directions, that is, they correspond in an asymptotic transformation. We show that this implies that the connecting lines of corresponding points form a discrete W-congruence. We derive some properties of discrete Laplace cycles of period four and describe two explicit methods for their construction.
Even astral configurations.
Group law on the intersection of two quadrics
Kegelschnitte in Moufangebenen.
Maximale (m, n)- Punktkonfigurationen.
Movable configurations.
Neue Fassung einer Verallgemeinerung des Satzes von Napoleon.
New closure conditions and some problems in loop theory.
Obtaining a 3D extension of Pascal theorem for non-degenerated quadrics and its complete configuration with the aid of a computer algebra system.
On configurations in 3-space without elementary planes and on the number of ordinary planes.
On Desargues geometrization of the characteristic of a skew field.