Varieties and finite closure conditions
John T. Baldwin, Joel Berman (1976)
Colloquium Mathematicae
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John T. Baldwin, Joel Berman (1976)
Colloquium Mathematicae
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G. Ewald (1988)
Discrete & computational geometry
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L. Ein (1986)
Inventiones mathematicae
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R. Hernández, I. Sols (1994)
Manuscripta mathematica
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V. Lakshmibai (1990)
Banach Center Publications
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Ewa Graczyńska, Dietmar Schweigert (2007)
Discussiones Mathematicae - General Algebra and Applications
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Derived varieties were invented by P. Cohn in [4]. Derived varieties of a given type were invented by the authors in [10]. In the paper we deal with the derived variety of a given variety, by a fixed hypersubstitution σ. We introduce the notion of the dimension of a variety as the cardinality κ of the set of all proper derived varieties of V included in V. We examine dimensions of some varieties in the lattice of all varieties of a given type τ. Dimensions of varieties of lattices...
V. B. Mehta, A. Ramanathan (1988)
Compositio Mathematica
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Paltin Ionescu (1985)
Mathematische Annalen
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J. Płonka (1987)
Colloquium Mathematicae
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Alfonz Haviar, Gabriela Monoszová (2001)
Discussiones Mathematicae Graph Theory
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In this paper we investigate varieties of orgraphs (that is, oriented graphs) as classes of orgraphs closed under isomorphic images, suborgraph identifications and induced suborgraphs, and we study the lattice of varieties of tournament-free orgraphs.
Yujiro Kawamata, Yoshinori Namikawa (1994)
Inventiones mathematicae
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Bjorn Adlandsvik (1988)
Journal für die reine und angewandte Mathematik
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Peter Kleinschmidt (1988)
Aequationes mathematicae
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