# An Algebraic Approach to Geometry

## Geometric Trilogy II

• Francis Borceux
Book

1. Front Matter
Pages I-XVII
2. Francis Borceux
Pages 1-50
3. Francis Borceux
Pages 51-118
4. Francis Borceux
Pages 119-136
5. Francis Borceux
Pages 137-180
6. Francis Borceux
Pages 181-194
7. Francis Borceux
Pages 195-265
8. Francis Borceux
Pages 267-340
9. Back Matter
Pages 341-430

### Introduction

This is a unified treatment of the various algebraic approaches to geometric spaces. The study of algebraic curves in the complex projective plane is the natural link between linear geometry at an undergraduate level and algebraic geometry at a graduate level, and it is also an important topic in geometric applications, such as cryptography.

380 years ago, the work of Fermat and Descartes led us to study geometric problems using coordinates and equations. Today, this is the most popular way of handling geometrical problems. Linear algebra provides an efficient tool for studying all the first degree (lines, planes, …) and second degree (ellipses, hyperboloids, …) geometric figures, in the affine, the Euclidean, the Hermitian and the projective contexts. But recent applications of mathematics, like cryptography, need these notions not only in real or complex cases, but also in more general settings, like in spaces constructed on finite fields. And of course, why not also turn our attention to geometric figures of higher degrees? Besides all the linear aspects of geometry in their most general setting, this book also describes useful algebraic tools for studying curves of arbitrary degree and investigates results as advanced as the Bezout theorem, the Cramer paradox, topological group of a cubic, rational curves etc.

Hence the book is of interest for all those who have to teach or study linear geometry: affine, Euclidean, Hermitian, projective; it is also of great interest to those who do not want to restrict themselves to the undergraduate level of geometric figures of degree one or two.

### Keywords

51N10, 51N15, 51N20, 51N35 Euclidean geometry Hermitian geometry affine geometry algebraic curves projective geometry

#### Authors and affiliations

• Francis Borceux
• 1
1. 1.Université catholique de LouvainLouvain-la-NeuveBelgium

### Bibliographic information

• DOI https://doi.org/10.1007/978-3-319-01733-4
• Copyright Information Springer International Publishing Switzerland 2014
• Publisher Name Springer, Cham
• eBook Packages Mathematics and Statistics
• Print ISBN 978-3-319-01732-7
• Online ISBN 978-3-319-01733-4