A new line Involution and the Classification Process
Constructing non-regular algebraic spreads with asymplecticly complemented regulization.
Die Öffnungsstrecken der Bahnregelflächen geschlossener räumlicher äquiformer Zwangläufe.
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.
Equiform kinematics and the geometry of line elements.
Étude d'un complexe du second ordre
Formules de réduction trigonométrique
Geradenfamilien, Enveloppen und Evoluten.
Geradenkongruenzen im fünfdimensionalen projektiven Raum
Grassmann spaces over hyperbolic and quasi hyperbolic spaces.
Isodynamic systems in Euclidean spaces and an -dimensional analogue of a theorem by Pompeiu
Kurven konstanter ganzer Krümmung und fester Hauptnormalenneigung.
Lineare Geradenkomplexe im Flaggenraum I3 (2).
Neue Geometrie des Raumes gegründet auf die Betrachtung der geraden Linie als Raumelement Abth.2 [Book]
On a generalized stereographic projection. (Zur verallgemeinerten stereographischen Projektion.)
On flocks of infinite quadratic cones.
Polynomial functions on the classical projective spaces
The polynomial functions on a projective space over a field = ℝ, ℂ or ℍ come from the corresponding sphere via the Hopf fibration. The main theorem states that every polynomial function ϕ(x) of degree d is a linear combination of “elementary” functions .
Projektion des Schnitts zweier Quadriken
Solution d'un problème de géométrie
Symplectic Plücker transformations.