71 citations · 267 across the 25 of their papers we have counts for
5 papers · 1 filter
Geometry of the mapping class group II: A biautomatic structure
Ursula Hamenstaedt
The mapping class group of a non-exceptional oriented surface of finite type admits a biautomatic structure.
Isometry groups of proper CAT(0)-spaces
Ursula Hamenstaedt
Let G be a closed subgroup of the isometry group of a proper CAT(0)-space X. We show that if G is non-elementary and contains a rank-one element then its second bounded cohomology…
Closed Teichmueller geodesics in the thin part of moduli space
Ursula Hamenstaedt
Let S be an oriented surface of genus g with m punctures. If 3g-3+m is at least 4 then we construct for every compact subset K of moduli space a closed Teichmueller geodesic not in…
Bounded cohomology, cross ratios and cocycles
Ursula Hamenstaedt
We use cross ratios to describe second real continuous bounded cohomology for locally compact topological groups. We also derive a rigidity result for cocycles with values in the i…
Bounded cohomology and isometry groups of hyperbolic spaces
Ursula Hamenstaedt
Let X be an arbitrary hyperbolic geodesic metric space and let G be a countable non-elementary weakly acylindrical group of isometries of X. We show that the second bounded cohomol…