Atnaujinkite slapukų nuostatas

Algebraic Theory of Quadratic Numbers 2013 ed. [Minkštas viršelis]

  • Formatas: Paperback / softback, 197 pages, aukštis x plotis: 235x155 mm, weight: 3285 g, 29 Illustrations, black and white; XI, 197 p. 29 illus., 1 Paperback / softback
  • Serija: Universitext
  • Išleidimo metai: 14-Sep-2013
  • Leidėjas: Springer-Verlag New York Inc.
  • ISBN-10: 1461477166
  • ISBN-13: 9781461477167
Kitos knygos pagal šią temą:
  • Formatas: Paperback / softback, 197 pages, aukštis x plotis: 235x155 mm, weight: 3285 g, 29 Illustrations, black and white; XI, 197 p. 29 illus., 1 Paperback / softback
  • Serija: Universitext
  • Išleidimo metai: 14-Sep-2013
  • Leidėjas: Springer-Verlag New York Inc.
  • ISBN-10: 1461477166
  • ISBN-13: 9781461477167
Kitos knygos pagal šią temą:

By focusing on quadratic numbers, this advanced undergraduate or master’s level textbook on algebraic number theory is accessible even to students who have yet to learn Galois theory. The techniques of elementary arithmetic, ring theory and linear algebra are shown working together to prove important theorems, such as the unique factorization of ideals and the finiteness of the ideal class group. The book concludes with two topics particular to quadratic fields: continued fractions and quadratic forms. The treatment of quadratic forms is somewhat more advanced than usual, with an emphasis on their connection with ideal classes and a discussion of Bhargava cubes.

The numerous exercises in the text offer the reader hands-on computational experience with elements and ideals in quadratic number fields. The reader is also asked to fill in the details of proofs and develop extra topics, like the theory of orders. Prerequisites include elementary number theory and a basic familiarity with ring theory.



This book shows the techniques of elementary arithmetic, ring theory and linear algebra working together to prove important theorems, such as the unique factorization of ideals and the finiteness of the ideal class group. Includes numerous exercises.

Recenzijos

This is a first introduction to algebraic number theory for students with a modest background in algebra. This slim volume is able to convey the beauty and many of the basic notions of algebraic number theory to beginners, which makes it a valuable addition to the literature. (C. Baxa, Monatshefte für Mathematik, Vol. 180, 2016)

Though many books offer study of quadratic forms and Pells equation by purely elementary means, the approach here strikes a perfect balance, achieving legible results while preparing students for deeper study. Summing Up: Recommended. Upper-division undergraduates and above. (D. V. Feldman, Choice, Vol. 51 (9), May, 2014)

This text could be used for an undergraduate introduction to algebraic number theory or as augmentation for a more advanced course. The writing is clear, with good motivations for the theory as it is introduced, so students should be able to understand why the theory is developed as it is. a very nice text, and a student who masters this material would have a solid background from which to do further study in either algebra or number theory. (Duncan A. Buell, Mathematical Reviews, April, 2014)

This book presents a smooth introduction to the first principles of algebraic number theory. The book is very well written, has worked examples and numerous exercises, and should easily accessible to readers with a good background in elementary number theory and the most basic algebraic notions. I highly recommend it to everyone interested in number theory beyond the most basic level. (Franz Lemmermeyer, zbMATH, Vol. 1280, 2014)

The central idea of this book is to focus attention solely on quadratic number fields and their rings of integers . the text intends to bring the subject of algebraic number theory down to the undergraduate level, it succeedsadmirably: it is written at a level that should be comprehensible to good undergraduates . this book is sufficiently different from these other references so as to be considered a fairly novel addition to the existing textbook literature. an interesting and well-written book. (Mark Hunacek, MAA Reviews, November, 2013)

1 Examples
1(26)
1.1 Review of Elementary Number Theory
1(7)
1.2 The Field Q[ √-3] and the Gauss Integers
8(7)
1.3 Quadratic Integers
15(2)
1.4 The Field Q[ √-3] and the Eisenstein Integers
17(3)
1.5 The Field Q[ √-5]
20(3)
1.6 The Field Q[ √319]
23(4)
2 A Crash Course in Ring Theory
27(18)
2.1 Basic Definitions
27(2)
2.2 Ideals, Homomorphisms, and Quotients
29(4)
2.3 Principal Ideals
33(3)
2.4 Operations on Ideals
36(5)
2.5 Prime and Maximal Ideals
41(4)
3 Lattices
45(16)
3.1 Group Structure of Lattices
45(3)
3.2 Linear Algebra Over Z
48(4)
3.3 Computing with Ideals
52(3)
3.4 Lattice Quotients
55(6)
4 Arithmetic in Q[ √D]
61(26)
4.1 Quadratic Fields
61(2)
4.2 The Ring of Integers
63(4)
4.3 Unique Factorization of Ideals: The Road Map
67(1)
4.4 Noether Rings
68(2)
4.5 Standard Form of an Ideal
70(3)
4.6 The Ideal Norm
73(4)
4.7 Fractional Ideals
77(3)
4.8 Unique Factorization of Ideals
80(1)
4.9 Prime Ideals in O
81(6)
5 The Ideal Class Group and the Geometry of Numbers
87(20)
5.1 The Ideal Class Group
87(4)
5.2 Minkowski's Theorem
91(4)
5.3 Application to Ideals
95(4)
5.4 Some Ideal Class Group Computations
99(8)
6 Continued Fractions
107(24)
6.1 Motivation
107(3)
6.2 Finite and Infinite Continued Fractions
110(4)
6.3 Continued Fraction of an Irrational Number
114(2)
6.4 Periodic Continued Fractions
116(5)
6.5 Computing Quadratic Continued Fractions
121(3)
6.6 Approximation by Convergent
124(3)
6.7 The Group of Units of a Real Quadratic Field
127(4)
7 Quadratic Forms
131(54)
7.1 Motivation
131(5)
7.2 Elementary Theory of Quadratic Forms
136(3)
7.3 Parameter of a Quadratic Form
139(2)
7.4 Linear Symmetries
141(3)
7.5 Group Actions
144(4)
7.6 Orientation
148(3)
7.7 The Narrow Ideal Class Group
151(3)
7.8 The Three Avatars
154(5)
7.9 Reduced Positive Definite Forms
159(6)
7.10 Reduced Indefinite Forms
165(7)
7.11 Form Composition and Bhargava Cubes
172(13)
Appendix 185(4)
Hints to Selected Exercises 189(4)
Further Reading 193(2)
Index 195
Mak Trifkovi is an assistant professor of mathematics at the University of Victoria.