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Matrične neenakosti in konveksne funkcije : doktorska disertacijaKosem, TomažGlavna tema disertacije so matrične neenakosti, ki izvirajo iz nekaterih skalarnih neenakosti za konveksne funkcije. S pomočjo funkcijskega računa lahko skalarje nadomestimo s hermitskimi matrikami ... in primerjamo ustrezne matrične količine, kot npr. unitarno invariantne norme, lastne vrednosti itd. Pogosto v matričnih neenakostih nastopa tudi Löwnerjeva delna urejenost. Poleg raznovrstnih operatorskih različic Jensenove neenakosti so v disertaciji predstavljeni rezultati, ki so povezani s subhomogenostjo in subaditivnostjo konkavnih funkcij. Dokazana je posplošitev Ando-Zhanove neenakosti med ▫$|||f(A) + f(B)|||$▫ in ▫$|||f(A + B)|||$▫ za konveksne/konkavne funkcije, kar je eden od najpomembnejših rezultatov v disertaciji. Zaključno poglavje pa se ukvarja z Youngovo neenakostjo ▫$ab \le \Phi(a) + \Psi(b)$▫ in z nekaterimi starimi in novimi matričnimi interpretacijami le-te.Type of material - dissertationPublication and manufacture - Ljubljana : [T. Kosem], 2008Language - slovenianCOBISS.SI-ID - 14730073
Author
Kosem, Tomaž
Other authors
Drnovšek, Roman, 1966-
Topics
linearna algebra |
teorija matrik |
konveksna funkcija |
majorizacija |
unitarno invariantna norma |
hermitska matrika |
neenakost |
operatorsko monotona funkcija |
operatorsko konveksna funkcija |
Jensenova neenakost |
Youngova neenakost |
Youngova funkcija |
geometrijska sredina |
linear algebra |
convex function |
convex function |
majorization |
unitarily invariant norm |
inequality |
operator monotone function, |
operator convex function |
Jensen's inequality |
Young's inequality |
Young's function |
geometric mean
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Database name | Field | Year |
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Kosem, Tomaž | 24329 |
Drnovšek, Roman, 1966- | 11709 |
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