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A variety of co-quasivarieties

Topology and its Applications
M. M. Clementino, Carlos Fitas, D. Hofmann   +2 more
semanticscholar   +1 more source

Quasivarieties of nilpotent groups of axiomatic rank $4$

Sibirskie Elektronnye Matematicheskie Izvestiya, 2020
A. Budkin
semanticscholar   +1 more source

Rectangular groupoids and related structures.

Discrete Math, 2013
Boykett T.
europepmc   +1 more source

Quasivarieties and varieties of ordered algebras: regularity and exactness †

Mathematical Structures in Computer Science, 2016
A. Kurz, J. Velebil
semanticscholar   +1 more source

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Least V-quasivarieties of MV-algebras

Fuzzy Sets and Systems, 2016
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Joan Gispert
exaly   +3 more sources

Profinite Locally Finite Quasivarieties

Studia Logica, 2023
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Anvar M. Nurakunov, Marina Schwidefsky
openaire   +3 more sources

Quasivarieties of distributivep-algebras

Algebra Universalis, 1992
The paper exhibits three results on quasivarieties of (distributive) \(p\)- algebras: There exists a quasivariety \(\mathbb{K}\) of such algebras such that \(\mathbb{B}_ 2\subset\mathbb{K}\subset\mathbb{B}_ 4\), but neither \(\mathbb{K}\subseteq\mathbb{B}_ 3\) nor \(\mathbb{B}_ 3\subseteq\mathbb{K}\), where \(\mathbb{B}_ i\) denotes the \(i\)-th Lee ...
Hernando Gaitan
exaly   +3 more sources

Joins of minimal quasivarieties

Studia Logica, 1995
Let \({\mathcal D}_2\) denote the variety of algebras \((L;\wedge, \vee, 0, c_0, c_1,1)\) which are distributive \((0,1)\)-lattices with two distinguished elements \(c_0, c_1\in L\). It is known that the only subdirectly irreducible algebras in \({\mathcal D}_2\) are \(2_{ij}= (\{0, 1\};\wedge, \vee, 0, i,j, 1)\) with \(i,j\in \{0, 1\}\). Let, further,
M E Adams, W Dziobiak, Dziobiak W
exaly   +3 more sources

Quasivarieties of Graphs and Independent Axiomatizability

Siberian Advances in Mathematics, 2018
Summary: In the present article, we continue to study the complexity of the lattice of quasivarieties of graphs. For every quasivariety \(K\) of graphs that contains a non-bipartite graph, we find a subquasivariety \(K'\subset K\) such that there exist \(2^{\omega}\) subquasivarieties \(K'' \in L_q(K')\) without covers (hence, without independent bases
Kravchenko, A. V., Yakovlev, A. V.
semanticscholar   +3 more sources

The lattice of quasivarieties of undirected graphs

Algebra Universalis, 2002
For a quasivariety \(\mathcal K\), let \(L(\mathcal K)\) denote the lattice of all quasivarieties contained in \(\mathcal K \). A quasivariety \(\mathcal K\) is said to be \(Q\)-universal if for any quasivariety \(\mathcal M\) of finite type, \(L(\mathcal M )\) is a homomorphic image of a sublattice of \(L(\mathcal K)\).
M E Adams, W Dziobiak, Dziobiak W
exaly   +3 more sources