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Monounary algebras with two direct limits. (English) Zbl 0966.08005
Summary: 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 $$A$$.

##### MSC:
 08A60 Unary algebras
##### Keywords:
monounary algebra; direct limit; endomorphism; retract