Results 1 to 10 of about 414,180 (260)

Schwarz norms for operators [PDF]

open access: bronzePacific Journal of Mathematics, 1968
James E. Williams
openalex   +4 more sources

Norm Bounds for Operator Extensions

open access: bronzeJournal of Mathematical Analysis and Applications, 1995
Consider the partial \(n\times n\) matrix \(F\) with bounded Hilbert space operator entries, where the lower triangular entries are specified and the strictly upper triangular entries are to be determined. Any choice of the strictly upper triangular entries provides a completion or extension of \(F\).
Mihály Bakonyi   +3 more
openalex   +3 more sources

Time-dependent unbounded Hamiltonian simulation with vector norm scaling [PDF]

open access: yesQuantum, 2021
The accuracy of quantum dynamics simulation is usually measured by the error of the unitary evolution operator in the operator norm, which in turn depends on certain norm of the Hamiltonian.
Dong An, Di Fang, Lin Lin
doaj   +1 more source

Norms of Free Operators [PDF]

open access: yesProceedings of the American Mathematical Society, 1988
We give a short and elementary proof of the formula for the norm of a free convolution operator on L 2 {L^2} of a discrete group. The formula was obtained in 1976 by C. Akemann and Ph. Ostrand, and by several other authors afterwards.
Massimo A. Picardello, Tadeusz Pytlik
openaire   +3 more sources

On Lipschitz continuity with respect to the Poincaré metric of linear contractions between Möbius gyrovector spaces

open access: yesJournal of Inequalities and Applications, 2021
For every linear operator between inner product spaces whose operator norm is less than or equal to one, we show that the restriction to the Möbius gyrovector space is Lipschitz continuous with respect to the Poincaré metric.
Keiichi Watanabe
doaj   +1 more source

Gap Between Operator Norm and Spectral Radius for the Square of Antidiagonal Block Operator Matrices

open access: yesCommunications in Advanced Mathematical Sciences, 2022
In this work, the gap between operator norm and spectral radius for the square of antidiagonal block operator matrices in the direct sum of Banach spaces has been investigated, and also the gap between operator norm and numerical radius for the square of
Elif Otkun Çevik
doaj   +1 more source

Operators That Achieve the Norm [PDF]

open access: yesIntegral Equations and Operator Theory, 2011
17 ...
Wladimir Neves, Xavier Carvajal
openaire   +3 more sources

Norms of a Product of Integral and Composition Operators between Some Bloch-Type Spaces

open access: yesAxioms, 2023
We present some formulas for the norm, as well as the essential norm, of a product of composition and an integral operator between some Bloch-type spaces of analytic functions on the unit ball, in terms of given symbols and weights.
Stevo Stević
doaj   +1 more source

Sum of some product-type operators from mixed-norm spaces to weighted-type spaces on the unit ball

open access: yesAIMS Mathematics, 2022
Let $ u_{j} $ be the holomorphic functions on the open unit ball $ \mathbb{B} $ in $ \mathbb{C}^{n} $, $ j = \overline{0, m} $, $ \varphi $ a holomorphic self-map of $ \mathbb{B} $, and $ \Re^{j} $ the $ j $th iterated radial derivative operator. In this
Cheng-shi Huang   +2 more
doaj   +1 more source

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