Characterizations of complete sublattices of a given complete lattice
type: Item
instance of: scholarly article
title: Characterizations of complete sublattices of a given complete lattice
zbMATH Open document ID: 0991.06005
author: Sr. Arworn
published in: Southeast Asian Bulletin of Mathematics
publication date: 2002-05-30T00:00:00Z
review text: Let \(L\) be a complete lattice. A mapping \(\varphi\) of \(L\) into itself is called a closure operator if \(\varphi (x)\geq x\) and \(\varphi (\varphi ( x))=\varphi (x)\) for all \(x\in X\) and \(\varphi (x)\leq\varphi (y)\) whenever \(x\leq y\) for all \(x,y\in L\). The dual notion is that one of a kernel operator. It is proved that \(U\) is a complete sublattice of \(L\) if and only if there exists a closure operator \(\varphi\) preserving all suprema with \(U=\{x\in L;\varphi (x)=x\}\) (or, dually, if and only if there exists a kernel operator \(\psi\) preserving all infima with \(U=\{x\in L;\psi (x)=x\}\)). By this fact the author derives and formulates a characterization of all complete sublattices of \(L\) in terms of Galois-closed relations.
reviewed by: Václav Koubek
Mathematics Subject Classification ID: 06B23
Mathematics Subject Classification ID: 06A15
zbMATH DE Number: 1747989
zbMATH Keywords: complete lattice
zbMATH Keywords: kernel operator
zbMATH Keywords: Galois connection
zbMATH Keywords: closure operator
MaRDI profile type: Publication
full work available at URL: s10012-001-0191-1
OpenAlex ID: W1992057410
DOI: 10.1007/S10012-001-0191-1
description: scientific article; zbMATH DE number 1747989