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On the relative reflexivity of finitely generated modules of operatorsMagajna, BojanZa vsak podprostor ▫${\cal S}$▫ v von Neumannovi algebri ▫${\cal R}$▫ naj bo ▫$ref_{\cal R}({\cal S})=\{B\in {\cal R}:(\forall X,Y \in {\cal R})/ (X{cal S}Y=0\Rightarrow XBY=0)\}$▫. Podprostor ... ▫${\cal S}$▫ imenujemo ▫${\cal R}$▫-refleksiven, če je ▫$ref_{\cal R}({\cal S})={\cal S}$▫. Če je ▫${\cal S}$▫ enorazsežen ali pa če je ▫${\cal S}$▫ končno razsežen in ▫${\cal R}$▫ ne vsebuje centralnih delov tipa ▫$I_n$▫ za ▫$n>1$▫, potem je ▫$\overline{\cal CS}$▫ ▫${\cal R}$▫-refleksiven in ▫$\overline{\cal R'S}$▫ refleksiven v ▫${\cal B(H)}$▫. Tukaj pomeni ▫${\cal R'}$▫ komutant, ▫${\cal C}$▫ pa center algebre ▫${\cal R}$▫, črta nad izrazom pa označuje zaprtje v šibki operatorski topologiji.Source: Transactions of the American Mathematical Society. - ISSN 0002-9947 (Let. 327, št. 1, 1991, str. 221-249)Type of material - article, component partPublish date - 1991Language - englishCOBISS.SI-ID - 8095833
Author
Magajna, Bojan
Topics
matematika |
funkcionalna analiza |
teorija operatorjev |
von Neumannove algebre |
podprostori operatorjev |
refleksivnost |
elementarni operatorji |
mathematics |
functional analysis |
operator theory |
von Neumann algebras |
subspaces of operators |
reflexivity |
elementary operators
source: Transactions of the American Mathematical Society. - ISSN 0002-9947 (Let. 327, št. 1, 1991, str. 221-249)
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