On Automorphism-Fixed Subgroups of a Fre
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A. Martino; E. Ventura
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Article
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2000
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Elsevier Science
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English
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Let F be a finitely generated free group, and let n denote its rank. A subgroup H of F is said to be automorphism-fixed, or auto-fixed for short, if there exists a set S of automorphisms of F such that H is precisely the set of elements fixed by every element of S; similarly, H is 1-auto-fixed if th