Results 21 to 30 of about 70,365 (263)
Orthogonality preserving property for pairs of operators on Hilbert $C^*$-modules
, 2021 We investigate the orthogonality preserving property for pairs of mappings on inner product $C^*$-modules extending existing results for a single orthogonality-preserving mapping.
Frank, Michael +2 more
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On Stokes operators with variable viscosity in bounded and unbounded domains [PDF]
Mathematische Annalen, 2008 The authors consider the Stokes problem with non-constant viscosity \(\nu(x)\) in bounded or unbounded domains in \(\mathbb R^d\). They assume \(\nu(x) = \nu_\infty + \nu'(x)\), \(\nu' \in W^{1,r_1}(\Omega)\) and \(\partial \Omega \in W^{2-1/r_2,r_2}\) with ...
Abels, Helmut, Terasawa, Yutaka
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Nonhomogeneous Dirichlet Problems with Unbounded Coefficient in the Principal Part
Axioms, 2022 The main result of the paper establishes the existence of a bounded weak solution for a nonlinear Dirichlet problem exhibiting full dependence on the solution u and its gradient ∇u in the reaction term, which is driven by a p-Laplacian-type operator with
Dumitru Motreanu
doaj +1 more source
Lower bounds for unbounded operators and semigroups
Journal of Operator Theory, 2017 Let $A$ be an unbounded operator on a Banach space $X$. It is sometimes useful to improve the operator $A$ by extending it to an operator $B$ on a larger Banach space $Y$ with smaller spectrum. It would be preferable to do this with some estimates for the resolvent of $B$, and also to extend bounded operators related to $A$, for example a semigroup ...
Batty, C, Geyer, F
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Extension of Spectral Scales to Unbounded Operators
International Journal of Mathematics and Mathematical Sciences, 2010 We extend the notion of a spectral scale to n-tuples of unbounded operators affiliated with a finite von Neumann Algebra. We focus primarily on the single-variable case and show that many of the results from the bounded theory go through in the unbounded
M. D. Wills
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A NOTE ON A TWO-PARAMETER FAMILY OF OPERATORS ${\MATHCAL A}^{B,C}$ ON WEIGHTED BERGMAN SPACES
Проблемы анализа, 2019 In this article, we prove that the two-parameter family of operators Ab,c is bounded on the weighted Bergman spaces B p α+c−1 if α + 2 < p and unbounded if α + 2 = p.
S. Naik, P. K. Nath
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The LQ/KYP problem for infinite-dimensional systems [PDF]
Opuscula Mathematica, 2017 Our aim is to present a solution to a general linear-quadratic (LQ) problem as well as to a Kalman-Yacubovich-Popov (KYP) problem for infinite-dimensional systems with bounded operators.
Piotr Grabowski
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Approximation of the Hilbert transform in the Lebesgue spaces
Journal of Numerical Analysis and Approximation Theory, 2023 The Hilbert transform plays an important role in the theory and practice of signal processing operations in continuous system theory because of its relevance to such problems as envelope detection and demodulation, as well as its use in relating the ...
Rashid Aliev, Lale Alizade
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Bounded Solutions of Semi-Linear Parabolic Differential Equations with Unbounded Delay Terms
Mathematics, 2023 In the present work, an initial boundary value problem (IBVP) for the semi-linear delay differential equation in a Banach space with unbounded positive operators is studied.
Allaberen Ashyralyev +1 more
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On-Line Monitoring for Temporal Logic Robustness [PDF]
, 2014 In this paper, we provide a Dynamic Programming algorithm for on-line monitoring of the state robustness of Metric Temporal Logic specifications with past time operators.
A. Bakirtzis +13 more
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