Ring Theory Proceedings of a Conference held in Granada, Spain, Sept

The papers in this proceedings volume are selected research papers in different areas of ring theory, including graded rings, differential operator rings, K-theory of noetherian rings, torsion theory, regular rings, cohomology of algebras, local cohomolog

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1328 J. L. Bueso P Jara

B. Torrecillas (Eds.)

Ring Theory Proceedings of a Conference held in Granada, Spain, Sept. 1-6, 1986

Springer-Verlag Berlin Heidelberg New York London Paris Tokyo

Editors

Jose Luis Bueso Pascual Jara BIas Torrecillas Departamento de Algebra, Facultad de Ciencias Universidad de Granada 18071 Granada, Spain

Mathematics Subject Classification (1980): 16-02, 16-06, 16A03, 16A06, 16A08, 16A26, 16A30, 16A54, 16A55, 16A61, 16A63 ISBN 3-540-19474-6 Springer-Verlag Berlin Heidelberg New York ISBN 0-387-19474-6 Springer-Verlag New York Berlin Heidelberg

This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, re-use of illustrations, recitation, broadcasting, reproduction on microfilms or in other ways, and storage in data banks. Duplication of this publication or parts thereof is only permitted under the provisions of the German Copyright Law of September 9, 1965, in its version of June 24, 1985, and a copyright fee must always be paid. Violations fall under the prosecution act of the German Copyright Law.

© Springer-Verlag Berlin Heidelberg 1988 Printed in Germany Printing and binding: Druckhaus Beltz, HemsbachfBergstr. 2146/3140-543210

EDITORIAL These proceedings contain papers presented in the meeting in "Ring Theory" celebrated in Granada (SPAIN).

Not all the lectures and communi-

cations appear here, some of them were given by invited speakers, who were unable to attend, and others are being published elsewhere.

The editors want to thank to the participants for their cooperation during the meeting and in preparing this volume; especially we thank to Professor F. van Oystaeyen.

IV ACKNOWLEDGEMENT

The

meeting

September

1st

held

until

at

the

University

September

is

6th,

of

Granada

financed

by

from the

following corporations: -

Junta de Andalucia.

-

CAYCrT.

-

Excelentisima Diputaci6n Provincial de Granada.

-

Banco Exterior de Espana.

-

Caja General de Ahorros de Granada.

-

Proyecto de investigaci6n CAYCrT:

-

Facultad de Ciencias.

-

Universidad de Granada.

We

thank

Department

of

the

staff

Algebra

for

of

the

Faculty

providing

in the organization of this meeting.

"Teoria de anillos".

of

facilities

Sciences and

and

support

TABLE OF CONTENTS ARA, P., "Stable range of alef-nought-continuous regular ring".

1

AVAMI-VAN OYSTAEYEN. On filtered rings with noetherian associated graded rings.

8

BEATTIE, M., "Duality theorems for group actions and gradings".

28

BRUNGS, H.H. "Chain rings and valuations".

33

BUSQUE, C., "Directly finite aleph-nought complete regular rings are unit-regular".

38

CAENEPEEL, S., "Cancelations theorems for Projective Graded Modules"

50

CAUCHON, G. "Centraliseurs dans les anneaux de polynCimes differentiels formels et leurs corps de fractions".

60

CEDO, F., "Regular group algebras whose maximal right and left quotient 69

rings coincide". DICKS, W., "A survey of recent work on the cohomology of