Đề tài " The Tits alternative for Out(Fn) II: A Kolchin type theorem "

This is the second of two papers in which we prove the Tits alternative for Out(Fn ). Contents 1. Introduction and outline 2. Fn -trees . Real trees . Real Fn -trees . Very small trees . Spaces of real Fn -trees . Bounded cancellation constants . Real graphs . Models and normal forms for simplicial Fn -trees . Free factor systems 3. Unipotent polynomially growing outer automorphisms . Unipotent linear maps . Topological representatives . Relative train tracks and automorphisms of polynomial growth . Unipotent representatives and UPG automorphisms .

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