2 citations · 2 across the 5 of their papers we have counts for
5 papers
Representations of the mapping class group of a non-orientable surface
Ferit Deniz, Wilhelm Singhof
By considering appropriate finite covering spaces of closed non-orientable surfaces, we construct linear representations of their mapping class group which have finite index image…
Generalized presentations of infinite groups, in particular of
Oleg Bogopolski, Wilhelm Singhof
We develop a theory of generalized presentations of groups. We give generalized presentations of the symmetric group for an arbitrary set and of the automorphism group o…
Tangential LS-category of K(pi,1)-foliations
Wilhelm Singhof, Elmar Vogt
A K(pi,1)-foliation is one for which the universal covers of all leaves are contractible (thus all leaves are K(pi,1)'s for some pi). In the first part of the paper we show that th…
Another point in homological algebra: Duality for discontinuous group actions
F. Grunewald, W. Singhof
We consider discontinuous operations of a group on a contractible -dimensional manifold . Let be a finite dimensional representation of over a field of charac…
Real polarizable Hodge structures arising from foliations
Christopher Deninger, Wilhelm Singhof
We construct real polarizable Hodge structures on the reduced leafwise cohomology of Kähler-Riemann foliations by complex manifolds. As in the classical case one obtains a hard Lef…