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International Journal of Mathematics and Mathematical Sciences
Volume 2003, Issue 71, Pages 4465-4471

Nagata rings and directed unions of Artinian subrings

Department of Mathematics, Faculty of Sciences Semlalia, University of Cadi Ayyad, P.O. Box 2390, Marrakech, Morocco

Received 24 October 2002

Copyright © 2003 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We investigate when a Nagata ring R(X) can be written as a directed union of Artinian subrings. For a family of zero-dimensional rings {Rα}αA, we show that αARα(Xα) is not a directed sum of Artinian subrings.