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Article . 2004 . Peer-reviewed
License: Springer TDM
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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
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Article . 2004
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On relative universality and Q-universality

On relative universality and \(Q\)-universality
Authors: Koubek, V.; Sichler, J.;

On relative universality and Q-universality

Abstract

A concrete category \(\mathcal K\) is universal if there exists a full and faithfull functor \(F: {\mathcal G}\rightarrow {\mathcal K}\) from the category \(\mathcal G\) of all graphs into \(\mathcal K\). If \(F\) assigns a \(\mathcal K\)-object with finite underlying set to every finite graph, \(\mathcal K\) is said to be finite-to-finite universal (or ff-universal). A quasivariety \(\mathcal K\) of algebras of finite type is \(Q\)-universal if the inclusion-ordered lattice \(L({\mathcal K})\) of all subquasivarieties of \(\mathcal K\) has the property that for any quasivariety \(\mathcal M\) of algebras of finite type, the lattice \(L({\mathcal M})\) is a quotient of a sublattice of \(L({\mathcal K})\). \textit{M. E. Adams} and \textit{W. Dziobiak} [Algebra Univers. 46, 253--283 (2001; Zbl 1059.08002)] proved that any ff-universal quasivariety must be \(Q\)-universal, and they asked whether a somewhat weaker hypothesis could lead to the same conclusion. The authors show that the hypothesis cannot be weakened to its naturally extreme form. They introduce a form of relative universality with respect to some ideal of morphisms. As the main result of the paper they present an example of a variety of distributive double \(p\)-algebras showing that for a comparatively large ideal, the relative universality does not imply \(Q\)-universality.

Related Organizations
Keywords

variety, endomorphism monoid, Pseudocomplemented lattices, distributive double \(p\)-algebra, quasivariety, \(Q\)-universality, relative universality, Automorphisms and endomorphisms of algebraic structures, Quasivarieties, Embedding theorems, universal categories

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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!
3
Average
Average
Average
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