On subnormal operators whose spectrum are multiply connected domains.
Carlsson, M. (2011)
The New York Journal of Mathematics [electronic only]
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Displaying similar documents to “Nonautonomous Livšic colligations and hyponormal operators.”
On subnormal operators whose spectrum are multiply connected domains.
Aluthge transforms of -hyponormal operators.
Cheng, Junxiang, Yuan, Jiangtao (2011)
Annals of Functional Analysis (AFA) [electronic only]
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On a reverse of Ando-Hiai inequality.
Seo, Yuki (2010)
Banach Journal of Mathematical Analysis [electronic only]
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AMD-numbers, compactness, strict singularity and the essential spectrum of operators.
Castejón, A., Corbacho, E., Tarieladze, V. (2002)
Georgian Mathematical Journal
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Distances between composition operators.
Valentin Matache (2007)
Extracta Mathematicae
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Composition operators C induced by a selfmap φ of some set S are operators acting on a space consisting of functions on S by composition to the right with φ, that is Cf = f º φ. In this paper, we consider the Hilbert Hardy space H on the open unit disk and find exact formulas for distances ||C - C|| between composition operators. The selfmaps φ and ψ involved in those formulas are constant, inner, or analytic selfmaps of the unit disk fixing the origin.
Generalized derivations and -algebras: comments and some open problems.
Mecheri, Salah (2009)
International Journal of Open Problems in Computer Science and Mathematics. IJOPCM
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Norm of a derivation and hyponormal operators.
Mohamed Barraa, Mohamed Boumazgour (2001)
Extracta Mathematicae
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Conditional multipliers and essential norm of between spaces.
Jabbarzadeh, M.R. (2010)
Banach Journal of Mathematical Analysis [electronic only]
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On the class operators.
Bachir, A., Segres, A. (2009)
International Journal of Open Problems in Computer Science and Mathematics. IJOPCM
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Matrix order in Bohr inequality for operators.
Fujii, Masatoshi, Zuo, Hongliang (2010)
Banach Journal of Mathematical Analysis [electronic only]
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Triangular Models and Asymptotics of Continuous Curves with Bounded and Unbounded Semigroup Generators
Kirchev, Kiril, Borisova, Galina (2005)
Serdica Mathematical Journal
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2000 Mathematics Subject Classification: Primary 47A48, Secondary 60G12. In this paper classes of K^r -operators are considered – the classes of bounded and unbounded operators A with equal domains of A and A*, finite dimensional imaginary parts and presented as a coupling of a dissipative operator and an antidissipative one with real absolutely continuous spectra and the class of unbounded dissipative K^r -operators A with different domains of A and A* and with real absolutely...
On some shift invariant integral operators, univariate case
George A. Anastassiou, Heinz H. Gonska (1995)
Annales Polonici Mathematici
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In recent papers the authors studied global smoothness preservation by certain univariate and multivariate linear operators over compact domains. Here the domain is ℝ. A very general positive linear integral type operator is introduced through a convolution-like iteration of another general positive linear operator with a scaling type function. For it sufficient conditions are given for shift invariance, preservation of global smoothness, convergence to the unit with rates, shape preserving...