On a theorem of Kontsevich.
Homology stability for outer automorphism groups of free groups.
Morita classes in the homology of automorphism groups of free groups.
Erratum to: Homology stability for outer automorphism groups of free groups.
Rational Homology of Bianchi Groups.
Equivariant outer space and automorphisms of free-by-finite groups.
The integral homology of SL2 and PSL2 of euclidean imaginary quadratic integers.
The Dehn functions of and
For at least 3, the Dehn functions of and are exponential. Hatcher and Vogtmann proved that they are at most exponential, and the complementary lower bound in the case was established by Bridson and Vogtmann. Handel and Mosher completed the proof by reducing the lower bound for bigger than 3 to the case . In this note we give a shorter, more direct proof of this last reduction.
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