Compact composition operators and Carleson measure in the upper half-plane.
S. D. Sharma, Romesh Kumar (2000)
Extracta Mathematicae
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S. D. Sharma, Romesh Kumar (2000)
Extracta Mathematicae
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S. D. Sharma, U. Bhanu (1999)
Extracta Mathematicae
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Jeff E. Lewis, Cesare Parenti (1980)
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
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Allen L. Shields (1983)
Mathematische Zeitschrift
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Appel, Matthew J., Bourdon, Paul S., Thrall, John J. (1996)
Experimental Mathematics
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C.J. NEUGEBAUER (1992)
Forum mathematicum
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Gajath Gunatillake (2017)
Concrete Operators
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Let Ω be an open simply connected proper subset of the complex plane and φ an analytic self map of Ω. If f is in the Hardy-Smirnov space defined on Ω, then the operator that takes f to f ⃘ φ is a composition operator. We show that for any Ω, analytic self maps that induce bounded Hermitian composition operators are of the form Φ(w) = aw + b where a is a real number. For ceratin Ω, we completely describe values of a and b that induce bounded Hermitian composition operators.
Mohammed Hichem Mortad (2011)
Colloquium Mathematicae
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We present a new approach to the question of when the commutativity of operator exponentials implies that of the operators. This is proved in the setting of bounded normal operators on a complex Hilbert space. The proofs are based on some results on similarities by Berberian and Embry as well as the celebrated Fuglede theorem.
Mecheri, Salah (2005)
Revista Colombiana de Matemáticas
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Hung Viet Le (2002)
Studia Mathematica
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The author proves the boundedness for a class of multiplier operators on product spaces. This extends a result obtained by Lung-Kee Chen in 1994.
Chun Guang Li, Ting Ting Zhou (2014)
Studia Mathematica
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A bounded linear operator T acting on a Hilbert space is said to be polaroid if each isolated point in the spectrum is a pole of the resolvent of T. There are several generalizations of the polaroid property. We investigate compact perturbations of polaroid type operators. We prove that, given an operator T and ε > 0, there exists a compact operator K with ||K|| < ε such that T + K is polaroid. Moreover, we characterize those operators for which a certain polaroid type property...
E. Diamantopoulos, Aristomenis Siskakis (2000)
Studia Mathematica
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The Hilbert matrix acts on Hardy spaces by multiplication with Taylor coefficients. We find an upper bound for the norm of the induced operator.
Diening, Lars, Samko, Stefan (2007)
Fractional Calculus and Applied Analysis
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Mathematics Subject Classification: 26D10, 46E30, 47B38 We prove the Hardy inequality and a similar inequality for the dual Hardy operator for variable exponent Lebesgue spaces.