On a characterization of the lattice of subsystems of a transition system.
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On a class of groupoids
Tomáš Kepka (1981)
Acta Universitatis Carolinae. Mathematica et Physica
On a class of subdirectly irreducible groupoids
Tomáš Kepka (1981)
Acta Universitatis Carolinae. Mathematica et Physica
On a power of relational structures
Vítězslav Novák (1985)
Czechoslovak Mathematical Journal
On a problem of B. Zelinka
V. R. Chandran (1987)
Czechoslovak Mathematical Journal
On a problem of B. Zelinka, II
V. R. Chandran (1987)
Czechoslovak Mathematical Journal
On a simple one-element extension of left zero semigroups
Sin Min Lee (1980)
Commentationes Mathematicae Universitatis Carolinae
On algebraic lattices and semisimple algebras
Ramalho, Margarita (1990)
Portugaliae mathematica
On Algebras all of Whose Subalgebras are Simple; Some Solutions of Plonka's Problem
Sin-Min Lee (1985)
Publications de l'Institut Mathématique
On bounding congruences in some algebras having the lattice structure
J. Płonka (1982)
Banach Center Publications
On central relations of complete lattices
Dietmar Schweigert, Magdalena Szymańska (1987)
Czechoslovak Mathematical Journal
On classes of algebraic systems closed with respect to quotients
I. Sain (1982)
Banach Center Publications
On congruence lattices of finite partial unary algebras
Danica Jakubíková-Studenovská (1981)
Commentationes Mathematicae Universitatis Carolinae
On congruence lattices of regular semigroups with Q-inverse transversals.
L.M. Wang (1995)
Semigroup forum
On congruence relations of monounary algebras. I
Danica Jakubíková-Studenovská (1982)
Czechoslovak Mathematical Journal
On congruence relations of monounary algebras. II
Danica Jakubíková-Studenovská (1983)
Czechoslovak Mathematical Journal
On congruences in direct sums of algebras
Pavol Zlatoš (1983)
Commentationes Mathematicae Universitatis Carolinae
On congruences of -sets
Boris M. Vernikov (1997)
Commentationes Mathematicae Universitatis Carolinae
We describe -sets whose congruences satisfy some natural lattice or multiplicative restrictions. In particular, we determine -sets with distributive, arguesian, modular, upper or lower semimodular congruence lattice as well as congruence -permutable -sets for .
On congruences of ...x-normal semigroups.
I. Levi, S. Seif (1991)
Semigroup forum
On connections between hypergraphs and algebras
Konrad Pióro (2000)
Archivum Mathematicum
The aim of the present paper is to translate some algebraic concepts to hypergraphs. Thus we obtain a new language, very useful in the investigation of subalgebra lattices of partial, and also total, algebras. In this paper we solve three such problems on subalgebra lattices, other will be solved in [[Pio4]]. First, we show that for two arbitrary partial algebras, if their directed hypergraphs are isomorphic, then their weak, relative and strong subalgebra lattices are isomorphic. Secondly, we prove...
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