On the Class Number of Abelian Number Fields

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Publisher : Springer
ISBN 13 : 3030015122
Total Pages : 394 pages
Book Rating : 4.0/5 (3 download)

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Book Synopsis On the Class Number of Abelian Number Fields by : Helmut Hasse

Download or read book On the Class Number of Abelian Number Fields written by Helmut Hasse and published by Springer. This book was released on 2019-04-23 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: With this translation, the classic monograph Über die Klassenzahl abelscher Zahlkörper by Helmut Hasse is now available in English for the first time. The book addresses three main topics: class number formulas for abelian number fields; expressions of the class number of real abelian number fields by the index of the subgroup generated by cyclotomic units; and the Hasse unit index of imaginary abelian number fields, the integrality of the relative class number formula, and the class number parity. Additionally, the book includes reprints of works by Ken-ichi Yoshino and Mikihito Hirabayashi, which extend the tables of Hasse unit indices and the relative class numbers to imaginary abelian number fields with conductor up to 100. The text provides systematic and practical methods for deriving class number formulas, determining the unit index and calculating the class number of abelian number fields. A wealth of illustrative examples, together with corrections and remarks on the original work, make this translation a valuable resource for today’s students of and researchers in number theory.

A Survey Of Trace Forms Of Algebraic Number Fields

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Publisher : World Scientific
ISBN 13 : 9814513520
Total Pages : 328 pages
Book Rating : 4.8/5 (145 download)

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Book Synopsis A Survey Of Trace Forms Of Algebraic Number Fields by : P E Conner

Download or read book A Survey Of Trace Forms Of Algebraic Number Fields written by P E Conner and published by World Scientific. This book was released on 1984-07-01 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Every finite separable field extension F/K carries a canonical inner product, given by trace(xy). This symmetric K-bilinear form is the trace form of F/K.When F is an algebraic number field and K is the field Q of rational numbers, the trace form goes back at least 100 years to Hermite and Sylvester. These notes present the first systematic treatment of the trace form as an object in its own right. Chapter I discusses the trace form of F/Q up to Witt equivalence in the Witt ring W(Q). Special attention is paid to the Witt classes arising from normal extensions F/Q. Chapter II contains a detailed analysis of trace forms over p-adic fields. These local results are applied in Chapter III to prove that a Witt class X in W(Q) is represented by the trace form of an extension F/Q if and only if X has non-negative signature. Chapter IV discusses integral trace forms, obtained by restricting the trace form of F/Q to the ring of algebraic integers in F. When F/Q is normal, the Galois group acts as a group of isometries of the integral trace form. It is proved that when F/Q is normal of prime degree, the integral form is determined up to equivariant integral equivalence by the discriminant of F alone. Chapter V discusses the equivariant Witt theory of trace forms of normal extensions F/Q and Chapter VI relates the trace form of F/Q to questions of ramification in F. These notes were written in an effort to identify central problems. There are many open problems listed in the text. An introduction to Witt theory is included and illustrative examples are discussed throughout.

The Genus Fields of Algebraic Number Fields

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Publisher : Springer
ISBN 13 : 3540375538
Total Pages : 123 pages
Book Rating : 4.5/5 (43 download)

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Book Synopsis The Genus Fields of Algebraic Number Fields by : M. Ishida

Download or read book The Genus Fields of Algebraic Number Fields written by M. Ishida and published by Springer. This book was released on 2006-12-08 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: a

Asymptotics of Cubic Number Fields with Bounded Second Successive Minimum of the Trace Form

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Publisher : diplom.de
ISBN 13 : 3961162468
Total Pages : 86 pages
Book Rating : 4.9/5 (611 download)

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Book Synopsis Asymptotics of Cubic Number Fields with Bounded Second Successive Minimum of the Trace Form by : Gero Brockschnieder

Download or read book Asymptotics of Cubic Number Fields with Bounded Second Successive Minimum of the Trace Form written by Gero Brockschnieder and published by diplom.de. This book was released on 2018-06-26 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a new way of investigating totally real algebraic number fields of degree 3. Instead of making tables of number fields with restrictions only on the field discriminant and/or the signature as described by Pohst, Martinet, Diaz y Diaz, Cohen, and other authors, we bound not only the field discriminant and the signature but also the second successive minima of the trace form on the ring of integers O(K) of totally real cubic fields K. With this, we eventually obtain an asymptotic behaviour of the size of the set of fields which fulfill the given requirements. This asymptotical behaviour is only subject to the bound X for the second successive minima, namely the set in question will turn out to be of the size O(X^(5/2)). We introduce the necessary notions and definitions from algebraic number theory, more precisely from the theory of number fields and from class field theory as well as some analytical concepts such as (Riemann and Dedekind) zeta functions which play a role in some of the computations. From the boundedness of the second successive minima of the trace form of fields we derive bounds for the coefficients of the polynomials which define those fields, hence obtaining a finite set of such polynomials. We work out an elaborate method of counting the polynomials in this set and we show that errors that arise with this procedure are not of important order. We parametrise the polynomials so that we have the possibility to apply further concepts, beginning with the notion of minimality of the parametrization of a polynomial. Considerations about the consequences of allowing only minimal pairs (B,C) (as parametrization of a polynomial f(t)=t^3+at^2+bt+c) to be of interest as well as a bound for the number of Galois fields among all fields in question and their importance in the procedure of counting minimal pairs, polynomials, and fields finally lead to the proof that the number of fields K with second successive minimum M2(K)

Quadratic Number Fields

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Publisher :
ISBN 13 : 9783030786533
Total Pages : 0 pages
Book Rating : 4.7/5 (865 download)

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Book Synopsis Quadratic Number Fields by : Franz Lemmermeyer

Download or read book Quadratic Number Fields written by Franz Lemmermeyer and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This undergraduate textbook provides an elegant introduction to the arithmetic of quadratic number fields, including many topics not usually covered in books at this level. Quadratic fields offer an introduction to algebraic number theory and some of its central objects: rings of integers, the unit group, ideals and the ideal class group. This textbook provides solid grounding for further study by placing the subject within the greater context of modern algebraic number theory. Going beyond what is usually covered at this level, the book introduces the notion of modularity in the context of quadratic reciprocity, explores the close links between number theory and geometry via Pell conics, and presents applications to Diophantine equations such as the Fermat and Catalan equations as well as elliptic curves. Throughout, the book contains extensive historical comments, numerous exercises (with solutions), and pointers to further study. Assuming a moderate background in elementary number theory and abstract algebra, Quadratic Number Fields offers an engaging first course in algebraic number theory, suitable for upper undergraduate students.

On Representation of Integers by Binary Quadratic Forms in Algebraic Number Fields

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Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.3/5 (243 download)

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Book Synopsis On Representation of Integers by Binary Quadratic Forms in Algebraic Number Fields by : Stig Christofferson

Download or read book On Representation of Integers by Binary Quadratic Forms in Algebraic Number Fields written by Stig Christofferson and published by . This book was released on 1962 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: