16 citations · 18 across the 3 of their papers we have counts for
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math.GR2008★ 1 cited
The Weyl group of type root systems extended by an abelian group
Georg W. Hofmann
We investigate the class of root systems obtained by extending an -type irreducible root system by a free abelian group . In this context there is a Weyl group and…
math.GR2007★ 1 cited
Symmetric Systems and their Applications to Root Systems Extended by Abelian Groups
Georg W. Hofmann
We investigate the class of root systems R obtained by extending an irreducible root system by a torsion-free group G. In this context there is a Weyl group W and a group U with th…
math.GR2006★ 16 cited
Weyl Groups with Coxeter Presentation and Presentation by Conjugation
Georg Hofmann
We investigate which Weyl groups have a Coxeter presentation and which of them at least have the presentation by conjugation with respect to their root system. For most concepts of…