If n G 3 and F is free of rank n, then Out Aut F s Out Out F s 1 . n n n แฎ 2000 Academic Press n is an isomorphism. Tits's theorem leads to a proof that the outer automor-
Endomorphisms of Free Groups That Preserve Automorphic Orbits
โ Scribed by Donghi Lee
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 86 KB
- Volume
- 248
- Category
- Article
- ISSN
- 0021-8693
No coin nor oath required. For personal study only.
โฆ Synopsis
We prove that if an endomorphism ฯ of a free group F n of a finite rank n preserves an automorphic orbit Orb AutF n W with W = 1, i.e., if ฯ Orb AutF n W โ Orb AutF n W , then ฯ is an automorphism. ๏ฃฉ 2002 Elsevier Science (USA)
๐ SIMILAR VOLUMES
We construct a family F F of Frobenius groups having abelian Sylow subgroups ลฝ and non-inner, class-preserving automorphisms. We show that any A-group that is, . a finite solvable group with abelian Sylow subgroups has a sub-quotient belonging to F F provided it has a non-inner, class-preserving aut
## Abstract A perfect edge colouring of a graph is defined by the property that all colour matchings are perfect matchings. Every edgeโcoloured graph determines a group of graph automorphisms which preserve the colours of the edges. If the graph is connected, then this group of colour preserving au
We show that the representations of certain automorphism groups of a free group afforded by compact Lie groups as described by Long can be decomposed into sums of trivial representations and MagnusแGassner representations.