Introduction to Classical Geometries - A. Galarza, J. Seade (Birkhauser, 2002) WW.pdf
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Ana Irene Ramírez Galarza
José Seade
Introduction to
Classical Geometries
Birkhäuser
Basel · Boston · Berlin
Authors:
Ana Irene Ramírez Galarza
Departamento de Matemáticas
Facultad de Ciencias
Universidad Nacional Autónoma de
México
Ciudad Universitaria, Circuito Exterior
México 04510 D. F.
México
e-mail: anai@matematicas.unam.mx
José Seade
Instituto de Matemáticas
Unidad Cuernavaca
Universidad Nacional Autónoma de México
Av. Universidad s/n
Ciudad Universitaria,
Lomas de Chamilpa
Cuernavaca, Morelos
México
e-mail: jseade@matem.unam.mx
Translated from the Spanish original “Introducción a la Geometría Avanzada”
© 2002 Las Prensas de Ciencia, UNAM, México
Figures by Juan Pablo Romero Méndez
2000 Mathematical Subject Classi cation: 51, 53, 14, 22, 83
Library of Congress Control Number: 2007922251
Bibliographic information published by Die Deutsche Bibliothek
Die Deutsche Bibliothek lists this publication in the Deutsche Nationalbibliogra e; detailed
bibliographic data is available in the Internet at http://dnb.ddb.de
ISBN 978-3-7643-7517-1 Birkhäuser Verlag AG, Basel – Boston – Berlin
This work is subject to copyright. All rights are reserved, whether the whole or part of the mate-
rial is concerned, speci cally the rights of translation, reprinting, re-use of illustrations, recita-
tion, broadcasting, reproduction on micro lms or in other ways, and storage in data banks. For
any kind of use permission of the copyright owner must be obtained.
© 2007 Birkhäuser Verlag AG
Basel • Boston • Berlin
P.O. Box 133, CH-4010 Basel, Switzerland
Part of Springer Science+Business Media
Printed on acid-free paper produced from chlorine-free pulp. TCF∞
Printed in Germany
ISBN-10: 3-7643-7517-5
e-ISBN-10: 3-7643-7518-3
ISBN-13: 978-3-7643-7517-1
e-ISBN-13: 978-3-7643-7518-8
9 8 7 6 5 4 3 2 1
www.birkhauser.ch
Goran Peskir
School of Mathematics
The University of Manchester
Sackville Street
Manchester
M60 1QD
United Kingdom
e-mail: goran@maths.man.ac.uk
Contents
Preface
vii
List of Symbols
x
1 Euclidean geometry 1
1.1 Symmetries ............................... 2
1.2 Rigidtransformations ......................... 15
1.3 Invariants under rigid transformations . . . . . . . . . . . . . . . . 28
1.4 Cylindersandtori ........................... 37
1.5 Finite subgroups of
E
(2) and
E
(3) .................. 46
1.6 Friezepatternsandtessellations.................... 58
2 A
ne geometry 75
2.1 The line at innity . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
2.2 A
netransformationsandtheirinvariants.............. 83
3 Projective geometry 91
3.1 Therealprojectiveplane ....................... 92
3.2 TheDualityPrinciple ......................... 99
3.3 The shape of
P
2
(
) .......................... 103
3.4 Coordinate charts for
P
2
(
) (and for
P
1
(
))............ 109
3.5 Theprojectivegroup.......................... 113
3.6 Invarianceofthecrossratio...................... 121
3.7 Thespaceofconics........................... 126
3.8 Projectivepropertiesoftheconics .................. 129
3.9 Polesandpolars ............................ 134
3.10 Elliptic geometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
4 Hyperbolic geometry 149
4.1 Modelsofthehyperbolicplane .................... 149
4.2 Transformationsofthehyperbolicplane ............... 157
4.3 Steinernetwork............................. 164
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