A gateway to number theory : applying the power of algebraic curves
著者
書誌事項
A gateway to number theory : applying the power of algebraic curves
（The Dolciani mathematical expositions, volume 57）
American Mathematical Society, c2021
- : pbk.
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注記
Includes bibliographical references (p.201-203) and index
内容説明・目次
内容説明
Challenge: Can you find all the integers $a$, $b$, $c$ satisfying $2a^{2} + 3b^{2} = 5c^{2}$? Looks simple, and there are in fact a number of easy solutions. But most of them turn out to be anything but obvious! There are infinitely many possibilities, and as any computer will tell you, each of $a$, $b$, $c$ will usually be large. So the challenge remains ... Find all integers$a$, $b$, $c$satisfying$2a^{2} + 3b^{2} = 5c^{2}$.
A major advance in number theory means this book can give an easy answer to this and countless similar questions. The idea behind the approach is transforming a degree-two equation in integer variables $a$, $b$, $c$ into a plane curve defined by a polynomial. Working with the curve makes obtaining solutions far easier, and the geometric solutions then get translated back into integers. This method morphs hard problems into routine ones and typically requires no more than high school math. (The complete solution to $2a^{2} + 3b^{2} = 5c^{2}$ is included in the book.) In addition to equations of degree two, the book addresses degree-three equations--a branch of number theory that is today something of a cottage industry, and these problems translate into ""elliptic curves''. This important part of the book includes many pictures along with the exposition, making the material meaningful and easy to grasp.
This book will fit nicely into an introductory course on number theory. In addition, the many solved examples, illustrations, and exercises make self-studying the book an option for students, thus becoming a natural candidate for a capstone course.
目次
A marriage for the ages
Viewing the whole algebraic curve
Entering the world of elliptic curves
Every elliptic curve is a group!
A million-dollar challenge
Every real elliptic curve lives in a donut
The genus
In conclusion $\ldots$
What is a smooth complex curve?
Algebraic curves in the disk model
Some code for this books's programs
Bibliography
Index
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