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E-raamat: Geometry of Continued Fractions

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Geometry of Continued FractionsSuurem pilt
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Traditionally a subject of number theory, continued fractions appear in dynamical systems, algebraic geometry, topology, and even celestial mechanics. The rise of computational geometry has resulted in renewed interest in multidimensional generalizations of continued fractions. Numerous classical theorems have been extended to the multidimensional case, casting light on phenomena in diverse areas of mathematics. This book introduces a new geometric vision of continued fractions. It covers several applications to questions related to such areas as Diophantine approximation, algebraic number theory, and toric geometry.

 

The reader will find an overview of current progress in the geometric theory of multidimensional continued fractions accompanied by currently open problems. Whenever possible, we illustrate geometric constructions with figures and examples. Each chapter has exercises useful for undergraduate or graduate courses.

Arvustused

Throughout the book many theorems are accompanied by constructive algorithms. Due to its rich content and connections to several parts of mathematics this volume will be of interest to graduate students and researchers not only in number theory and discrete geometry. (C. Baxa, Monatshefte für Mathematik, Vo. 180, 2016)

Karpenkov begins with a distinctive treatment of continued fraction foundations emphasizing lattice geometry. One-dimensional continued fractions connect to two-dimensional lattices--very apt for illustration. Summing Up: Recommended. Upper-division undergraduates through researchers/faculty. (D. V. Feldman, Choice, Vol. 51 (10), June, 2014)

The book is well written and is easy to read and navigate. The book features a number of helpful illustrations and tables, a detailed index, and a large bibliography.This text is likely to become a valuable resource for researchers and students interested in discrete geometry and Diophantine approximations, as well as their rich interplay and many connections. (Lenny Fukshansky, zbMATH, Vol. 1297, 2014)

Preface.- Introduction.- Part
1. Regular continued fractions:
Chapter
1. Classical notions and definitions.
Chapter
2. On integer geometry.
Chapter
3. Geometry of regular continued fractions.
Chapter
4. Complete invariant of integer angles.
Chapter
5. Integer trigonometry for integer angles.
Chapter
6. Integer angles of integer triangles.
Chapter
7. Continued fractions and SL(2; Z) conjugacy classes. Elements of Gauss Reduction Theory. Markoff spectrum.
Chapter
8. Lagrange theorem.
Chapter
9. Gauss-Kuzmin statistics.
Chapter
10. Geometric approximation aspects.
Chapter
11. Geometry of continued fractions with real elements and the second Kepler law.
Chapter
12. Integer angles of polygons and global relations to toric singularities.- Part
2. Klein polyhedra:
Chapter
13. Basic notions and definitions of multidimensional integer geometry.
Chapter
14. On empty simplices, pyramids, parallelepipeds.
Chapter
15. Multidimensional continued fractions in the sense of Klein.
Chapter16. Dirichlet groups and lattice reduction.
Chapter
17. Periodicity of Klein polyhedra. Generalization of Lagrange theorem.
Chapter
18. Multidimensional Gauss-Kuzmin statistics.
Chapter
19. On construction of multidimensional continued fractions.
Chapter
20. Gauss Reduction in higher dimensions.
Chapter
21. Decomposable forms. Relation to Littlewood and Oppenheim conjectures.
Chapter
22. Approximation of maximal commutative subgroups.
Chapter
23. Other generalizations of continued fractions.- Bibliography?.
For different subjects contributed to this book, the author was awarded a Fellowship of the City of Paris (France), a Lise Meitner Fellowship (Austria) and the Moscow Mathematical Society Prize (Russia).
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