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Rational Homology of Bianchi Groups.

Karen Vogtmann — 1985

Mathematische Annalen

Equivariant outer space and automorphisms of free-by-finite groups.

Karen Vogtmann; Sava Krstic — 1993

Commentarii mathematici Helvetici

The integral homology of SL2 and PSL2 of euclidean imaginary quadratic integers.

Joachim Schwermer; Karen Vogtmann — 1983

Commentarii mathematici Helvetici

The Dehn functions of $O u t (F_{n})$ and $A u t (F_{n})$

Martin R. Bridson; Karen Vogtmann — 2012

Annales de l’institut Fourier

For $n$ at least 3, the Dehn functions of $O u t (F_{n})$ and $A u t (F_{n})$ are exponential. Hatcher and Vogtmann proved that they are at most exponential, and the complementary lower bound in the case $n = 3$ was established by Bridson and Vogtmann. Handel and Mosher completed the proof by reducing the lower bound for $n$ bigger than 3 to the case $n = 3$ . In this note we give a shorter, more direct proof of this last reduction.