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Algebra Universalis
Article . 1994 . Peer-reviewed
License: Springer TDM
Data sources: Crossref
image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
zbMATH Open
Article . 1994
Data sources: zbMATH Open
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The structure of the lattices of quasivarieties

Authors: Gorbunov, V. A.;

The structure of the lattices of quasivarieties

Abstract

For an algebraic system \(A\) and a quasivariety \(\mathcal K\) let \(\text{Con}_{{\mathcal K}} A\) be the lattice of all congruence relations \(\theta\) on \(A\) such that \(A/\theta\in {\mathcal K}\). Define the embedding relation \(\leq\) as follows: \(\theta\leq \theta'\) iff \(A/\theta'\) is embeddable into \(A/\theta\). Let \(\text{Sp}(\text{Con}_{{\mathcal K}} A, \leq)\) be the lattice of algebraic \(\leq\)-closed subsets of \(\text{Con}_{{\mathcal K}} A\). The author proves that every lattice \(L_ q({\mathcal K})\) of subquasivarieties of \(\mathcal K\) is isomorphic to the inverse limit of lattices \(\text{Sp}(\text{Con}_{{\mathcal K}} G_ i, \leq)\) for some set of finitely presented systems \(G_ i\) of the quasivariety \(\mathcal K\). In particular, the lattice \(L_ q({\mathcal K})\) is residually finite for every locally finite quasivariety \(\mathcal K\) of finite type. Also some new properties of embedding relations on congruence lattices of free systems are investigated.

Related Organizations
Keywords

subquasivariety lattices, congruence lattices free systems, quasivariety, Lattices of varieties, free systems, embedding relation, inverse limit, Quasivarieties

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
19
Average
Top 10%
Top 10%
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