Efficient covering designs of the complete graph.
Eigenfunctions of the Laplace operators for buildings of type
We consider for an affine building of type Helgason's conjecture with respect to Laplace operators defined over different types of vertices. We prove that there are cases in which the conjecture fails, since there exist eigenfunctions which are not the Poisson transform of finitely additive measures at the maximal boundary of the building.
Ein "affiner" Beweis des Satzes von v. Staudt - Schleiermacher.
Eine Bemerkung über endliche Ovale ungerader Ordnung
Eine Ebene im projektiven Raum mit Homomorphismus
Eine neue Klasse endlicher Translationsebenen.
Endliche zyklische Ebenen.
Enumerating blueprints, and an application.
Enumerative properties of generalized associahedra.
Es gibt keine 4-affine Ebene der Ordnung 4.
Extended near hexagons and line systems.
Extending arcs: an elementary proof.
Extending locally truncated chamber systems by sheaves.
Extending the dual of the Petersen graph.