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Actions of higher-rank lattices on free groups
Published 19 Apr 2010 in math.GR and math.GT | (1004.3222v2)
Abstract: If $G$ is a semisimple Lie group of real rank at least 2 and $\Gamma$ is an irreducible lattice in $G$, then every homomorphism from $\Gamma$ to the outer automorphism group of a finitely generated free group has finite image.
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