2 papers
math.GT2020
Geometric description of Virtual Schottky groups
Ruben A. Hidalgo
A virtual Schottky group is a Kleinian group containing a Schottky group as a finite index normal subgroup. These groups correspond to those groups of automorphisms of clos…
math.AG2019
Zapponi-orientable dessins d'enfants
E. Girondo, G. González-Diez, R. A. Hidalgo +1
Almost two decades ago Zapponi introduced a notion of orientability of a clean dessin d'enfant, based on an orientation of the embedded bipartite graph. We extend this concept, whi…