Lectures on the Theory of Algebraic Functions of One Variable

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314 Max Deuring Mathematisches Institut der Universit~t G6ttingen, G6ttingen/BRD

Lectures on the Theory of Algebraic Functions of One Variable

Springer-Verlag Berlin-Heidelberg



New York 1 9 73

A M S Subject Classifications (1970): 14H05, 1 4 H 10.

I S B N 3-540-06152-5 S p r i n g e r - V e r l a g Berlin • H e i d e l b e r g . N e w Y o r k I S B N 0-387-06152-5 Springer- V e r l a g N e w Y o r k • H e i d e l b e r g • Berlin

This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically those of translation, reprinting, re-use of illustrations, broadcasting, reproduction by photocopying machine or similar means, and storage in data banks. Under § 54 of the German Copyright Law where copies are made for other than private use, a fee is payable to the publisher, the amount of the fee to be determined by agreement with the publisher. © by Springer-Verlag Berlin • Heidelberg 1973. Library of Congress Catalog Card Number 72-97679. Printed in Germany, Offsetdruck: Julius Beltz, Hemsbach/Bergstr.

PREFACE

These

lectures

Research, notes

have been given at the Tata Institute

Bombay,

in ~958.

The supply of the original m i m e o g r a p h e d

having been exhausted

B. Eckmann to republish The aim of these introduction variable,

for some time,

theory of algebraic

to some i n t e r e s t i n g

they still serve this purpose. this new edition all the more

apart

Notes

the proposal

in M a t h e m a t i c s "

aspects

1972

series.

notes by C.P.

of one

of it, and I believe,

It seemed wise not to make

from correcting misprints

since the original

functions

changes

in

and a few minor errors,

Ramanujan

left n o t h i n g

to be desired.

March,

of

was to give a more or less s e l f - c o n t a i n e d

to the algebraic

or, at least,

I accepted

them in the "Lecture

lectures

of F u n d a m e n t a l

M. Deuring,

G~ttingen

TABLE

CHAPTER

I

Lecture

1

Function

-

fields

OF CONTENTS

and v a l u a t i o n s

..................

1

§ I. I n t r o d u c t i o n § 2. O r d e r e d

Lecture

2

§ 3.

3

§ 4. The

Lecture

4

2

groups

§ 3. V a l u a t i o n s , Lecture

places

and v a l u a t i o n

6

valuations

of a r a t i o n a l

of places

§ 6. V a l u a t i o n s

of a l g e b r a i c

§ 7. The

of a place

degree

§ 8. I n d e p e n d e n c e

The R i e m a n n - R o c h

theorem

20

.......................

Lecture

6

§ 10

The

§ 11

The p r i n c i p a l

§ 12

The R i e m a n n

§ 13

Repartitions

§ 14

Differentials

§ 15

The

§ 16

Rational

function

§ 17

Function rational

fields of degree function field

9

20

space

L(¢~)

23

3O 34

Riemann-Roch

theorem

39

fields

43

zero

§ 19. Fields

of genus

one

§ 20. The

CHAPTER

III

-

Zeta

greatest

function

29

theorem

of genus

10

24

divisors

§ 18. Fields Lecture

common

two over

a

11

51 divisor

and L - f u n c t i o n s

§ 22. The

infinite

product

§ 23. The

functional

44 49

of a class

.................

§ 21. The Zeta functi