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- Forschungszentrum JülichDE94 papers
- Centre National de la Recherche ScientifiqueFR87 papers
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- Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)DE32 papers
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4 papers · 2 filters
Generating abelian groups by addition only
Benjamin Klopsch, Vsevolod F. Lev
We define the positive diameter of a finite group with respect to a generating set to be the smallest non-negative integer such that every element of can b…
On the Abelianization of Congruence Subgroups of Aut(F_2)
Daniel Appel
Let F_n be the free group of rank n and let Aut^+(F_n) be its special automorphism group. For an epimorphism pi : F_n -> G of the free group F_n onto a finite group G we call Gamma…
On endomorphisms of torsion-free hyperbolic groups
O. Bogopolski, E. Ventura
Let be a torsion-free -hyperbolic group with respect to a finite generating set . Let and be elements of such that is con…
On abstract commensurators of groups
Laurent Bartholdi, Oleg Bogopolski
We prove that the abstract commensurator of a nonabelian free group, an infinite surface group, or more generally of a group that splits appropriately over a cyclic subgroup, is no…