Abstract
For n≥3, the natural map Out(Fn)→Aut(Kn) from the outer automorphism group of the free group of rank n to the group of simplicial automorphisms of the spine of outer space is an isomorphism.
Citation
Martin R. Bridson. Karen Vogtmann. "The symmetries of outer space." Duke Math. J. 106 (2) 391 - 409, 1 February 2001. https://doi.org/10.1215/S0012-7094-01-10625-X
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