Results 251 to 260 of about 443,680 (282)

Essential Norms of Composition Operators

Integral Equations and Operator Theory, 2004
Recently, there has been considerable interest in studying lower and upper estimates for the essential norms of composition operators in function spaces. Sometimes, as a consequence, a necessary and sufficient condition for the composition operator to be compact on the function space can be obtained.
Gorkin, Pamela, MacCluer, Barbara D.
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Norm Inequalities for Positive Operators

Letters in Mathematical Physics, 1998
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Bhatia, Rajendra, Kittaneh, Fuad
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Induced Operator Norms

1997
State-space characterizations of the H∞ norm for linear time-invariant systems have been obtained for both continuous-time [16] and discretetime systems [52], by considering the connection between the norm bound ‖G‖∞ < γ and the existence of spectral factors of the Hermitian function I−γ−2G~G.
Marc A. Peters, Pablo A. Iglesias
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Some Norm Inequalities for Operators

Canadian Mathematical Bulletin, 1999
AbstractLet Ai , Bi and Xi (i = 1, 2,…,n) be operators on a separable Hilbert space. It is shown that if f and g are nonnegative continuous functions on [0, ∞) which satisfy the relation f(t)g(t) = t for all t in [0, ∞), thenfor every r > 0 and for every unitarily invariant norm. This result improves some known Cauchy-Schwarz type inequalities. Norm
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Norms of Complex Harmonic Projection Operators

Canadian Journal of Mathematics, 2003
AbstractIn this paper we estimate the (Lp – L2)-norm of the complex harmonic projectors πℓ,ℓ′, 1 ≤ p ≤ 2, uniformly with respect to the indexes ℓ, ℓ′. We provide sharp estimates both for the projectors πℓ,ℓ′, when ℓ, ℓ′ belong to a proper angular sector in ℕ × ℕ, and for the projectors πℓ0 and π0ℓ.
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Operator Norms

2023
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Operator Norms

1988
G. R. Belitskii, Yurii I. Lyubich
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Norm and essential norm of an integral‐type operator from the logarithmic Bloch space to the Bloch‐type space on the unit ball

Mathematical Methods in the Applied Sciences, 2022
Stevo Stević
exaly  

On the norm of an integral operator and applications

Journal of Mathematical Analysis and Applications, 2006
Bicheng Yang
exaly  

On the norm of a Hilbert's type linear operator and applications

Journal of Mathematical Analysis and Applications, 2007
Bicheng Yang
exaly