The Group Fixed by a Family of Injective Endomorphisms of a Free Group

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American Mathematical Society, Jan 1, 1996 - Mathematics - 81 pages
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This monograph contains a proof of the Bestvina-Handel Theorem (for any automorphism of a free group of rank n, the fixed group has rank at most n) that to date has not been available in book form. The account is self-contained, simplified, purely algebraic, and extends the results to an arbitrary family of injective endomorphisms.
The topological proof by Bestvina-Handel is translated into the language of groupoids and many details previously left to the reader are meticulously verified in this text.

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