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Trikotljivost družine operatorjev : magistrsko deloKramar Fijavž, MarjetaDružino linearnih preslikav imenujemo trikotljivo, če vsem preslikavam iz družine v neki bazi vektorskega prostora pripadajo zgornje trikotne matrike. Pojem trikotljivosti je povezan s pojmom ... razcepnosti oziroma z obstojem netrivialnih invariantnih podprostorov za dano družino. Posebno lepo te pojme poveže Radjavijeva lema trikotenja, ki je sestavni del večine dokazov. Obravnavamo potrebne in zadostne pogoje za trikotljivost različnih družin operatorjev. Podrobno si ogledamo družine operatorjev na končno razsežnem vektorskem prostoru. Najlepše rezultate o trikotljivosti dobomo pri algebrah operatorjev. Opazujemo različne lastnosti spektra polgrupe operatorjev in njihov vpliv na trikotljivost. V zadnjem poglavju se preselimo v neskončno razsežen (Banachov oz. Hilbertov) prostor in na njem obravnavamo družine kompaktnih operatorjev. Z Ringroseovimi metodami in izrekom Lomonosova dobimo lepe karakterizacije trikotljivih algeber kompaktnih opeartorjev. Ogledamo si nedavni rezultat Turovskega o razcepnosti polgrupe kompaktnih kvazinilpotentov, s pomočjo katerega pridelamo nekaj posplošitev rezultatov o trikitljivosti polgrup kompaktnih operatorjev.Type of material - master's thesisPublication and manufacture - Ljubljana : [M. Kramar], 1999Language - slovenianCOBISS.SI-ID - 8727129
Author
Kramar Fijavž, Marjeta
Other authors
Omladič, Matjaž
Topics
simultaneous triangularization |
reducibility |
invariant subspace |
operator algebras |
operator semigroups |
spectral conditions |
compact operators
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FMF, Mathematical Library, Lj. | Skladišče-Jadranska 21 10941/96 |
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Kramar Fijavž, Marjeta | 20037 |
Omladič, Matjaž | 09573 |
Source: Personal bibliographies
and: SICRIS
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