Homomorphisms of unary algebras and of their expansions
W. Lampe, J. Sichler, V. Trnková (1993)
Colloquium Mathematicae
Danica Jakubíková-Studenovská (1991)
Mathematica Bohemica
In this paper the notion of an interval in a partial monounary algebra is introduced and pairs , of partial monounary algebras are investigated such that each interval in is also an interval in , and conversely.
Trnková, V, Sichler, J. (2008)
Theory and Applications of Categories [electronic only]
Vernikov, Boris M. (2000)
Beiträge zur Algebra und Geometrie
Miroslav Novotný (1990)
Archivum Mathematicum
Emília Halušková (2000)
Mathematica Bohemica
In this paper we describe all algebras with one unary operation such that by a direct limit construction exactly two nonisomorphic algebras can be obtained from .
Jiří Novotný (1988)
Mathematica Slovaca
Jan Chvalina (1981)
Archivum Mathematicum
Danica Jakubíková-Studenovská (2003)
Czechoslovak Mathematical Journal
Fraïssé introduced the notion of a -set-homogeneous relational structure. In the present paper the following classes of monounary algebras are described: , , —the class of all algebras which are 2-set-homogeneous with respect to subalgebras, connected subalgebras, connected partial subalgebras, respectively, and , , —the class of all algebras which are 2-homogeneous with respect to subalgebras, connected subalgebras, connected partial subalgebras, respectively.
Jakubíková-Studenovská, Danica (2003)
Mathematica Bohemica
Danica Jakubíková-Studenovská (2003)
Mathematica Bohemica
In this paper we investigate the validity of a cancellation law for some classes of monounary algebras.
Miroslav Novotný (1984)
Časopis pro pěstování matematiky
Danica Jakubíková-Studenovská (2005)
Czechoslovak Mathematical Journal
In this note we deal with a question concerning monounary algebras which is analogous to an open problem for partially ordered sets proposed by Duffus and Rival.
J. Płonka (1979)
Colloquium Mathematicae
J. Płonka (1982)
Banach Center Publications
Péter Pál Pálfy (1978)
Commentationes Mathematicae Universitatis Carolinae
Danica Jakubíková-Studenovská (1988)
Czechoslovak Mathematical Journal
Danica Jakubíková-Studenovská (1981)
Commentationes Mathematicae Universitatis Carolinae
Danica Jakubíková-Studenovská (1982)
Czechoslovak Mathematical Journal
Danica Jakubíková-Studenovská (1983)
Czechoslovak Mathematical Journal