A characterization of congruence classes of quasigroups
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A characterization of distributive lattices by tolerance lattices
Ivan Chajda (1979)
Archivum Mathematicum
A characterization of polarities whose lattice of polars is Boolean
František Šik (1981)
Czechoslovak Mathematical Journal
A characterization of the group congruences on a semigroup.
G.M.S. Gomes (1993)
Semigroup forum
A characterization of tolerance-distributive tree semilattices
Ivan Chajda, Bohdan Zelinka (1987)
Czechoslovak Mathematical Journal
A common generalization of permutability and 0-permutability
Ivan Chajda (2001)
Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica
A contribution to the theory of decompositions of partial algebras
Jaroslav Švrček (1981)
Sborník prací Přírodovědecké fakulty University Palackého v Olomouci. Matematika
A factorization of quasiorder hypergroups
Ivan Chajda, Šárka Hošková (2004)
Commentationes Mathematicae Universitatis Carolinae
The contribution is devoted to the question of the interchange of the construction of a quasiorder hypergroup from a quasiordered set and the factorization.
A generalization of equivalence relations.
Prešić, Marica D. (1986)
Publications de l'Institut Mathématique. Nouvelle Série
A lattice of homomorphs
Paz Jiménez Seral (1993)
Rendiconti del Seminario Matematico della Università di Padova
A note on idempotent separating congruences on a regular semigroup
K. Kumaresan (1984)
Czechoslovak Mathematical Journal
A note on subdirectly irreducible groupoids
Tomáš Kepka (1981)
Acta Universitatis Carolinae. Mathematica et Physica
A note on the finite extensivity property
Jarmila Fauknerová (1981)
Commentationes Mathematicae Universitatis Carolinae
A note on the strongly compatible tolerances on an arbitrary semigroup
K. Kumaresan (1984)
Czechoslovak Mathematical Journal
A note on tolerance lattices
Josef Niederle (1982)
Časopis pro pěstování matematiky
A note on tolerance lattices of algebras with restricted similarity type
Bedřich Pondělíček (1995)
Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica
A note on triangular schemes for weak congruences
Ivan Chajda, Branimir Šešelja, Andreja Tepavčević (2005)
Czechoslovak Mathematical Journal
Some geometrical methods, the so called Triangular Schemes and Principles, are introduced and investigated for weak congruences of algebras. They are analogues of the corresponding notions for congruences. Particular versions of Triangular Schemes are equivalent to weak congruence modularity and to weak congruence distributivity. For algebras in congruence permutable varieties, stronger properties—Triangular Principles—are equivalent to weak congruence modularity and distributivity.
A note on varieties with distributive subalgebra lattices
Ivan Chajda (1992)
Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica
A regular a-semigroups inducing a certain lattice.
P. Huisheng (1996)
Semigroup forum
A remark on polynomial functions over finite monoids.
R.F. Tichy (1981)
Semigroup forum
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