J. Jezek, D. Stanovsky, Department of Algebra, Charles University, Sokolovska 83, 186 75 Praha 8, Czech Republic, e-mails: firstname.lastname@example.org, email@example.com; P. Markovic, Department of Mathematics and Informatics, Faculty of Science, University of Novi Sad, trg Dositeja Obradovica 3, 21000 Novi Sad, Serbia and Montenegro, e-mail: firstname.lastname@example.org
Abstract: We prove that a finite unary algebra with at least two operation symbols is a homomorphic image of a (finite) subdirectly irreducible algebra if and only if the intersection of all its subalgebras which have at least two elements is nonempty.
Keywords: subdirectly irreducible unary algebra
Classification (MSC 2000): 08A60, 08B26
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