Results 81 to 90 of about 205 (147)

Axioms for the category of Hilbert spaces. [PDF]

open access: yesProc Natl Acad Sci U S A, 2022
Heunen C, Kornell A.
europepmc   +1 more source

An Extremal Problem for Characteristic Functions [PDF]

open access: yes, 2013
Suppose E is a subset of the unit circle T and Hinfinity C Linfinity is the Hardy subalgebra. We examine the problem of finding the distance from the characteristic function of E to znHinfinity.
Chalendar, Isabelle   +8 more
core   +1 more source

On Optimal Solutions to Two-Block H∞ Problems [PDF]

open access: yes, 1997
In this paper we obtain a new formula for the minimum achievable disturbance attenuation in two-block H 1 problems. This new formula has the same structure as the optimal H 1 norm formula for noncausal problems, except that doubly-infinite (so ...
Thomas Kailath, Babak Hassibi
core  

Dual Toeplitz operators on the orthogonal complement of the harmonic Bergman space

open access: yesAIMS Mathematics
<p>This paper aimed to give some partial answers to the zero-product problem and commutativity problem concerning dual Toeplitz operators with nonharmonic symbols on the orthogonal complement of the harmonic Bergman space. Using the symbol map, we described the necessary condition for $ S_{\varphi_1}S_{\varphi_2}\cdots S_{\varphi_N} = 0 $ with ...
openaire   +2 more sources

Optimization of highly uncertain feedback in H [infinity] [PDF]

open access: yes, 1998
This dissertation presents a new mathematical framework to optimize performance of multi-input multi-output feedback systems subject to large dynamical uncertainty.
Djouadi, Mohamed Seddik.
core  

Noncommutative Interpolation And Poisson Transforms [PDF]

open access: yes, 1997
. General results of interpolation (eg. Nevanlinna-Pick) by elements in the noncommutative analytic Toeplitz algebra F 1 (resp. noncommutative disc algebra An ) with consequences to the interpolation by bounded operator-valued analytic functions in ...
Alvaro Arias, Gelu Popescu
core  

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