On the one class of hyperbolic systems.
Adler, Vsevolod E., Shabat, Alexey B. (2006)
SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
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Displaying similar documents to “On the variety Csub ”
On the one class of hyperbolic systems.
Separation properties in congruence lattices of lattices
Miroslav Ploščica (2000)
Colloquium Mathematicae
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We investigate the congruence lattices of lattices in the varieties . Our approach is to represent congruences by open sets of suitable topological spaces. We introduce some special separation properties and show that for different n the lattices in have different congruence lattices.
An equational basis in four variables for the three-element tournament
G. Grätzer, A. Kisielewicz, B. Wolk (1992)
Colloquium Mathematicae
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Finitely generated almost universal varieties of 0-lattices.
Koubek, V., Sichler, J. (2005)
Commentationes Mathematicae Universitatis Carolinae
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Finitely generated almost universal varieties of -lattices
Václav Koubek, Jiří Sichler (2005)
Commentationes Mathematicae Universitatis Carolinae
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A concrete category is (algebraically) if any category of algebras has a full embedding into , and is if there is a class of -objects such that all non-constant homomorphisms between them form a universal category. The main result of this paper fully characterizes the finitely generated varieties of -lattices which are almost universal.
Combinatorial trees in Priestley spaces
Richard N. Ball, Aleš Pultr, Jiří Sichler (2005)
Commentationes Mathematicae Universitatis Carolinae
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We show that prohibiting a combinatorial tree in the Priestley duals determines an axiomatizable class of distributive lattices. On the other hand, prohibiting -crowns with does not. Given what is known about the diamond, this is another strong indication that this fact characterizes combinatorial trees. We also discuss varieties of 2-Heyting algebras in this context.