Introduction to the Theory of Algebraic Functions of One Variable

Couverture
American Mathematical Soc., 31 déc. 1951 - 188 pages
This classical book, written by a famous French mathematician in the early 1950s, presents an approach to algebraic geometry of curves treated as the theory of algebraic functions on the curve. Among other advantages of such an approach, it allowed the author to consider curves over an arbitrary ground field. Among topics discussed in the book are the theory of divisors on a curve, the Riemann-Roch theorem, $p$-adic completion, extensions of the fields of functions (covering theory) and of the fields of constants, and the theory of differentials on a curve. The last chapter, which is more analytic in flavor, treats the theory of Riemann surfaces. Prerequisites for reading are minimal and include only an advanced undergraduate algebra course.
 

Table des matières

PLACES AND DIVISORS _
1
c
6
The order function The degree of a place
9
The theorem of independence
11
Divisors
13
The divisor of a function
15
THE THEOREM 0F RIEMANNROCH
20
Fields of genus zero
23
EXTENSIONS OF THE FIELD or CONSTANTS _
79
Relatively algebraically closed subfields
82
Commutative algebras
85
Definition of the extended field
88
The effect on a place v
92
The effect on the genus _
96
EXACT DIFFERENTIALS
101
Trace and cotrace of differentials _
103

Fields of genus one _ _
24
Repartitions
25
Difierentials
28
The canonical class _
31
The local components of a differential
33
Fields of elliptic functions
34
THE pADIC COMPLETIONS
39
Hensels lemma
43
Structure of padic completions
45
Generalization of the notion of repartition
46
Residues of a differential
48
EXTENSIONS or FIELDS or ALGEBRAIC FUNCTIONS or ONE VARIABLE
51
The case of normal algebraic extensions
53
Integral bases
54
Kronecker products of commutative algebras v
57
Extension of the padic completion
59
The Puiseux expansions
64
Norm and conorm trace and cotrace
65
The different _
69
Structure of hyperelliptic fields
75
in an arbitrary field
108
Derivations of fields
111
Derivations and differentials
116
Extension of the notion of cotrace
119
Derivations of the field of constants _ _
125
Differentials of the second kind
127
THE RIEMANN SURFACE
133
Meromorphic functions on the Riemann surface
136
On singular homology theory
141
Periods of differentials
145
The bilinear function jw w
153
Definition of the intersection numbers
156
Geometric lemmas _
162
The homology groups of the Riemann surface
166
The theorem of Abel _
173
Fields of genus one
177
The Riemann surface as an analytic manifold
178
The bilinear inequalities of Riemann
183
INDEX
187
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