School of Mathematics, University of Tasmania, G.P.O. Box 252-37, Hobart, Tasmania 7001, Australia, e-mail: email@example.com
Abstract: For commutative algebras over a field, we describe all varieties closed for taking algebras which are sums of their two subalgebras in the variety.
Keywords: varieties, sums of algebras
Classification (MSC2000): 16R10; 16S99
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