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On a theorem by Farb and Masur |
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| Authors: | Koji Fujiwara |
| Institution: | Mathematical Institute, Tohoku University, Sendai, 980-8578 Japan |
| Abstract: | Farb and Masur showed that an irreducible lattice in a semisimple Lie group of rank at least two always has finite image by a homomorphism into the outer automorphism group of a closed, orientable surface group. We point out that their theorem extends to the outer automorphism groups of a certain class of torsion-free, freely indecomposable word-hyperbolic groups. |
| Keywords: | Word-hyperbolic groups JSJ-decomposition lattices in higher-rank Lie groups mapping class groups |
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