Results 31 to 40 of about 494 (99)

The logic induced by effect algebras. [PDF]

Soft comput, 2020
Chajda I, Halaš R, Länger H.
europepmc   +1 more source

Exact Embedding Functors for Module Categories and Submodule Lattice Quasivarieties

Journal of Algebra, 1999
For rings with unit \(R\) and \(S\) the relation \(R\precsim S\) means that there exists an exact embedding functor \(F\colon R\text{-Mod}\to S\text{-Mod}\). By \({\mathcal L}(R)\) is denoted the quasi-variety of lattices generated by the family of all submodule lattices \(\text{Su}(_RM)\) for \(M\in R\text{-Mod}\) (a lattice \(L\) is in \({\mathcal L}(
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Rectangular groupoids and related structures.

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

Сharacterization of distributive lattices of quasivarieties of unars

Chebyshevskii sbornik, 2021
Vladimir Konstantinovich Kartashov, Anna Vladimirovna Kartashova   +1 more
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The complexity of quasivariety lattices of unary algebras

BULLETIN OF THE KARAGANDA UNIVERSITY-MATHEMATICS, 2017
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Structure of quasivariety lattices. III. Finitely partitionable bases

Algebra i logika, 2020
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Kravchenko, A. V., Nurakunov, A. M., Schwidefsky, M. V.   +2 more
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Structure of quasivariety lattices. I. Independent axiomatizability

Algebra i logika, 2017
A quasivariety \(K\) has an \(\omega \)-independent quasi-equational basis in a quasivariety \(M\) if there are a basis \(\Phi \) of \(K\) in \(M\) and a partition \(\Phi =\cup_ ...
Kravchenko, A. V., Nurakunov, A. M., Schwidefsky, M. V.   +2 more
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Structure of quasivariety lattices. II. Undecidable problems

Algebra i logika, 2019
The paper provides sufficient conditions for a quasivariety \(\mathbf M\) to contain continuumly many subquasivarieties \(\mathbf K\) such that the membership problem for finitely presented structures in \(\mathbf M\) is undecidable in \(\mathbf K\), the finite membership problem is undecidable in \(\mathbf K\), the quasi-equational theory of \(\mathbf
Kravchenko, A. V., Nurakunov, A. M., Schwidefsky, M. V.   +2 more
openaire   +1 more source