On the Homeotopy Groups of Surfaces.
Generators of Free Product with Amalgamation of two Infinite Cyclic Groups.
On Decomposititons of Discontinuous Groups of the Plane.
Algorithmen für einfache Kurven auf Flächen II.
Algorithmen für einfache Kurven auf Flächen.
Endliche Gruppen von Abbildungsklassen gefaserter 3-Mannigfaltigkeiten.
Über Erweiterungen von Z und Z2 * Z2 durch nichteuklidische kristallographische Gruppen.
Order Reduced Reidemeister-Schreier Subgroup Presentations and Applications.
Nombre de ponts et générateurs méridiens des entrelacs de Montesinos.
On Heegaard Decompositions of Torus Knot Exteriors and Related Seifert Fibre Spaces.
Rescuing the Whitehead Method for Free Products, II: The Algorithm.
Unteralgebren von ...(2, IR) und Untergruppen von LF (2,IR).
On the Nielsen Method in Free Products with Amalgamated Subgroups.
Realization of primitive branched coverings over closed surfaces following the hurwitz approach
Let V be a closed surface, H⊑π1(V) a subgroup of finite index l and D=[A 1,...,A m] a collection of partitions of a given number d≥2 with positive defect v(D). When does there exist a connected branched covering f:W→V of order d with branch data D and f∶W→V It has been shown by geometric arguments [4] that, for l=1 and a surface V different from the sphere and the projective plane, the corresponding branched covering exists (the data D is realizable) if and only if the data D fulfills the Hurwitz...
Rescuing the Whitehead Method for Free Products, I: Peak Reduction.
Computer calculation of the degree of maps into the Poincaré homology sphere.
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