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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Da: -OnTimeBooks-, Phoenix, AZ, U.S.A.
Condizione: good. A copy that has been read, remains in good condition. All pages are intact, and the cover is intact. The spine and cover show signs of wear. Pages can include notes and highlighting and show signs of wear, and the copy can include "From the library of" labels or previous owner inscriptions. 100% GUARANTEE! Shipped with delivery confirmation, if you're not satisfied with purchase please return item! Ships via media mail. Codice articolo OTV.0821805649.G
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Da: Leopolis, Kraków, Polonia
Soft cover. Condizione: Fine. 8vo (25 cm), IX, 83 pp. Publisher's laminated wrappers (minor shelf-wear). A self-contained research monograph presenting the first book-length proof of the Bestvina-Handel theorem, establishing that for any automorphism of a free group of rank n, the fixed subgroup has rank at most n, and extending the result to arbitrary families of injective endomorphisms. The authors reformulate the original topological argument in the language of groupoids, incorporating Stallings's graph pullback techniques to show that for any finitely generated free group F, injective endomorphism ?, and subgroup H of F, the rank of H ? Fix(?) does not exceed the rank of H; from this it follows that the subgroup fixed by a family S of injective endomorphisms has rank at most that of F. Four chapters treat groupoids and abstract maps of graphs, measuring devices including the Perron-Frobenius theorem and metric graphs, properties of the basic operations (collapsing, subdividing, folding), and minimal representatives and fixed subgroupoids, followed by open problems, bibliography, and index. A concise but influential contribution to combinatorial and geometric group theory. Codice articolo 009827
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