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Date: 2015-01-13 05:18:35Algebra Abstract algebra Mathematics Semigroup theory Algebraic structures Ring theory Commutative algebra Semigroup Inverse element Cancellative semigroup Zero divisor Cover | PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY Volume 138, Number 12, December 2010, Pages 4231–4242 SArticle electronically published on July 9, 2010Add to Reading ListSource URL: www.renyi.huDownload Document from Source WebsiteFile Size: 455,41 KBShare Document on Facebook |