Weighted Expansions for Canonical Desingularization

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910

Shreeram S. Abhyankar

Weighted Expansions for Canonical Desingularization With Foreword by U. Orbanz

Springer-Verlag Berlin Heidelberg New York 1982

Author

Shreeram S. Abhyankar Purdue University, Div. Math. Sci. West Lafayette, IN 47907, USA

AMS Subject Classifications (1980): 14E15

ISBN 3-540-11195-6 Springer-Verlag Berlin Heidelberg New York ISBN 0-387-11195-6 Springer-Verlag New York Heidelberg 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 "Verwertungsgesellschaft Wort", Munich.

© by Springer-Verlag Berlin Heidelberg 1982 Printed in Germany Printing and binding: Beltz Offsetdruck, Hemsbach/Bergstr. 2141/3140-543210

Table of contents Section

Page

Foreword

v

Preface .

1

Notation.

3

§ 2.

Semigroups

4

§ 3.

Strings .

5

§

1.

§ 4.

Semigroup strings with restrictions

§ 5.

Ordered semigroup strings with restrictions

10

§ 6.

Strings on rings

11

7

§ 7.

Indeterminate strings

14

§ 8.

Indeterminate strings with restrictions

21

§ 9.

Restricted degree and order for indeterminate strings

26

§10.

Indexing strings.

29

§11.

Nets

31

§12.

Semigroup nets with restrictions

33

§13.

Ordered semigroup nets with restrictions

36

§14.

Nets on rings

37

§15.

Indeterminate nets

39

§16.

Indeterminate nets with restrictions

46

§17.

Restricted degree and order for indeterminate nets.

53

§18.

Prechips.

••••.

57

§19.

Isobars for prechips and Premonic polynomials

59

§20.

Substitutions • • • • • .

• •

67

§21.

Substitutions with restrictions

73

§22.

Coordinate nets and Monic polynomials

82

§23.

Graded ring of a ring at an ideal

85

§24.

Graded ring of a ring

88

§25.

Graded rings at strings and nets and the notions of separatedness and regularity for strings and nets.

90

§26.

Inner products and further notions of separatedness and regularity for strings . . . . . • . • • • • .

104

§27.

Inner products and further notions of senaratedness and regularity for nets • • • . • . •

109

§28.

Weighted isobars and weighted initial forms • • • •

113



. .

IV

Initial forms for regular strings . • • • •

126

§30.

Initial forms for regular strings and nets

150

§31.

Protochips and parachips • • • • • • • • .

161

§32.

N-support of an indexing string for ?

162

§33.

Prescales • •

§34.

Derived pres cales

165

§35.

Supports of prescales

167

§36.

Protoscales . .

168

§37.

Inner products for protoscales

170

§38.

Scales and isobars .

171

§39.

Properties of derived prescales

176

§40.

Isobars for derived scales .

203

§41.

Isobars and initial forms for scales

205

§42.

Initial forms for scales and regular nets

214

§43.

Isobars for protochips .

220

§44.

Initial forms for protochips a