Emilia Haluskova, Mathematical Institute, Slovak Academy of Sciences, Gresakova 6, 040 01 Kosice, Slovakia, e-mail: ehaluska@mail.saske.sk
Abstract: In this paper we describe all algebras $A$ with one unary operation such that by a direct limit construction exactly two nonisomorphic algebras can be obtained from $A$.
Keywords: monounary algebra, direct limit, endomorphism, retract
Classification (MSC 1991): 08A60
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