Homomorphisms of unary algebras and of their expansions
Intervals in partial monounary algebras
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.
Limit preserving full embeddings.
Modular elements in congruence lattices of -sets.
Mono-unary algebras in the work of Czechoslovak mathematicians
Monounary algebras with two direct limits
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 .
Morphisms of a certain class of monounary algebras
Note on compatible binary relations on algebras
On 2-homogeneity of monounary algebras
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.
On a cancellation law for monounary algebras.
On a cancellation law for monounary algebras
In this paper we investigate the validity of a cancellation law for some classes of monounary algebras.
On a relationship between monoids and monounary algebras
On a representation of monounary algebras
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.
On automorphism groups of relational systems and universal algebras
On bounding congruences in some algebras having the lattice structure
On certain congruence lattices of finite unary algebras
On completions of partial monounary algebras
On congruence lattices of finite partial unary algebras
On congruence relations of monounary algebras. I
On congruence relations of monounary algebras. II