44 citations · 216 across the 16 of their papers we have counts for
16 papers
Blocking sets in chain geometries
Andrea Blunck, Hans Havlicek, Corrado Zanella
In this paper we give some basic results on blocking sets on minimum size for a finite chain geometry.
Divisible designs from twisted dual numbers
Andrea Blunck, Hans Havlicek, Corrado Zanella
The generalized chain geometry over the local ring of twisted dual numbers, where is a finite field, is interpreted as a divisible design obtained from an imprimitive…
Lifting of divisible designs
Andrea Blunck, Hans Havlicek, Corrado Zanella
The aim of this paper is to present a construction of -divisible designs for , because such divisible designs seem to be missing in the literature. To this end, tools such…
On distant-isomorphisms of projective lines
Andrea Blunck, Hans Havlicek
We determine all distant-isomorphisms between projective lines over semilocal rings. In particular, for those semisimple rings that do not have a simple component which is isomorph…
Radical parallelism on projective lines and non-linear models of affine spaces
Andrea Blunck, Hans Havlicek
We introduce and investigate an equivalence relation called "radical parallelism" on the projective line over a ring. It is closely related with the Jacobson radical of the underly…
On bijections that preserve complementarity of subspaces
Andrea Blunck, Hans Havlicek
The set of all -dimensional subspaces of a -dimensional vector space is endowed with two relations, complementarity and adjacency. We consider bijections from on…