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math.KT2013★ 1 cited

Equivariant K-homology of Bianchi groups with non-trivial class group

Mathias Fuchs

We compute the equivariant K-homology of the groups PSL_2 of imaginary quadratic integers with trivial and non-trivial class-group. This was done before only for cases of trivial c…

math.KT2006

Cyclic Cohomology and Higher Rank Lattices

Mathias Fuchs

We give a new proof of the absence of non-trivial idempotents in the group ring of torsion-free cocompact lattices in SL(n,C). It is based on the following procedure. We lift the c…