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Title:Reflexivity defect of spaces of linear operators
Authors:ID Bračič, Janko (Author)
ID Kuzma, Bojan (Author)
Files:URL http://dx.doi.org/10.1016/j.laa.2008.07.024
 
Language:English
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:IAM - Andrej Marušič Institute
Abstract:For a finite-dimensional linear subspace ▫{$\mathscr{S}} \subseteq {\mathscr{L}} (V,W)$▫ and a positive integer ▫$k$▫, the ▫$k$▫-reflexivity defect of ▫$\mathscr{S}$▫ is defined by ▫${\mathrm{rd}}_k ({\mathscr{S}}) = \dim({\mathrm{Ref}}_k (\mathscr{S})/\mathscr{S})$▫ where ▫${\mathrm{Ref}}_k$▫ is the ▫$k$▫-reflexive closure of ▫$\mathscr{S}$▫. We study this quantity for two-dimensional spaces of operators and for single generated algebras and their commutants.
Keywords:mathematics, operator theory, reflexivity defect, reflexivity, two-dimensional space of operators, single generated algebra, commutant
Year of publishing:2009
Number of pages:str. 344-359
Numbering:Vol. 430, iss. 1
PID:20.500.12556/RUP-7728 This link opens in a new window
ISSN:0024-3795
UDC:517.983:512.643
DOI:10.1016/j.laa.2008.07.024 This link opens in a new window
COBISS.SI-ID:14977369 This link opens in a new window
Publication date in RUP:02.04.2017
Views:2475
Downloads:194
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Secondary language

Language:Slovenian
Title:Refleksivnostni defekt prostorov linearnih operatorjev
Abstract:Za končnodimenzionalen linearen prostor ▫${\mathscr{S}} \subseteq {\mathscr{L}} (V,W)$▫ in naravno število ▫$k$▫ je ▫$k$▫-refleksivnostni defekt prostora ▫${\mathscr{S}}$▫ definiran kot ▫${\mathrm{rd}}_k ({\mathscr{S}}) = \dim({\mathrm{Ref}}_k (\mathscr{S})/\mathscr{S})$▫, pri čemer je ▫${\mathrm{Ref}}_k$▫ ▫$k$▫-refleksivnostno zaprtje za ▫$\mathscr{S}$▫. V članku izračunamo refleksivnostni defekt za dvodimenzionalne prostore operatorjev, za algebre generirane z enim operatorjem in za njihove komutante.
Keywords:matematika, teorija operatorjev, refleksivnost, refleksivnostni defekt, dvodimenzionalen prostor operatorjev, algebra generirana z enim operatorjem, komutant


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