FUNDAMENTALNAYA
I PRIKLADNAYA MATEMATIKA
(FUNDAMENTAL AND APPLIED MATHEMATICS)
2002, VOLUME 8, NUMBER 3, PAGES 721-727
A. V. Kelarev
Abstract
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For any semigroup $S$ , we completely describe all varieties
closed for taking $S$ -graded rings. Also, we describe all
varieties closed for sums of two rings.
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Last modified: February 17, 2003