Variations on a theme of Euler

In this first-of-its-kind book, Professor 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. The text, a translation of Dr. Ono's earlier work, provides a solution to this problem by employing three areas of mathematics: linear algebra, algebraic geometry, and simple algebras. This English-language edition presents a new chapter on arithmetic of quadratic maps, along with an appendix featuring a short survey of subsequent research on congruent numbers by Masanari Kida. The original appendix containing historical and scientific comments on Euler's Elements of Algebra is also included. Variations on a Theme of Euler is an important reference for researchers and an excellent text for a graduate-level course on number theory.