Variations on a Theme of Euler: Quadratic Forms, Elliptic Curves, and Hopf Maps / Edition 1

by Takashi Ono

Overview

The first six chapters and Appendix 1 of this book appeared in Japanese in a book of the same title 15years aga (Jikkyo, Tokyo, 1980).At the request of some people who do not wish to learn Japanese, I decided to rewrite my old work in English. This time, I added a chapter on the arithmetic of quadratic maps (Chapter 7) and Appendix 2, A Short Survey of Subsequent Research on Congruent Numbers, by M. Kida. Some 20 years ago, while rifling through the pages of Selecta Heinz Hopj (Springer, 1964), I noticed a system of three quadratic forms in four variables with coefficientsin Z that yields the map of the 3-sphere to the 2-sphere with the Hopf invariant r =1 (cf. Selecta, p. 52). Immediately I feit that one aspect of classical and modern number theory, including quadratic forms (Pythagoras, Fermat, Euler, and Gauss) and space elliptic curves as intersection of quadratic surfaces (Fibonacci, Fermat, and Euler), could be considered as the number theory of quadratic maps-especially of those maps sending the n-sphere to the m-sphere, i.e., the generalized Hopf maps. Having these in mind, I deliveredseverallectures at The Johns Hopkins University (Topics in Number Theory, 1973-1974, 1975-1976, 1978-1979, and 1979-1980). These lectures necessarily contained the following three basic areas of mathematics: v vi Preface Theta Simple Functions Aigebras Elliptic Curves Number Theory Figure P.l.

Product Details

ISBN-13:	9780306447891
Publisher:	Springer US
Publication date:	11/30/1994
Series:	University Series in Mathematics
Edition description:	1995
Pages:	347
Product dimensions:	6.10(w) x 9.25(h) x 0.03(d)

Table of Contents

I. Introduction.- 1. Quadratic Forms.- 2. Algebraic Varieties.- 3. Plane Algebraic Curves.- 4. Space Elliptic Curves.- 5. Quadratic Spherical Maps.- 6. Hurwitz Problem.- 7. Arithmetic of Quadratic Maps.- Answers and Hints to Selected Exercises.- A1.4. Chronological Table and Record.- References.- Appendix 2. A Short Survey of Subsequent Research on Congruent Numbers.- Masanari Kida.- References.

Editorial Reviews

An updated and expanded text in English (prepared by the author) of the 1980 Japanese edition (Jikkyo Publishing Co., Ltd., Tokyo). Ono postulates that one aspect of classical and modern number theory, including quadratic forms and space elliptic curves as intersections of quadratic surfaces, can be considered as the number theory of Hopf maps. Useful as a reference for researchers and a text for a graduate- level course on number theory. Annotation c. Book News, Inc., Portland, OR (booknews.com)

Booknews

From a review of the Japanese-language edition:
‘A beautifully written book...The statement of the problem is very clear-that is, [the author] claims that one aspect of classical and modern number theory can be considered as the number theory of Hopf maps-and then he solves this problem....skillfully and perspectively organized...This book will be a good introductory textbook...There has never been a textbook similar to this....I highly recommend this book.'
Michio Kuga, Professor, late of State University of New York at Stony Brook

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