Search Results - "VOLOK, DAN"
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1
Relative reproducing kernel Hilbert spaces
Published in Proceedings of the American Mathematical Society (01-11-2014)“…We introduce a reproducing kernel structure for Hilbert spaces of functions where differences of point evaluations are bounded. The associated reproducing…”
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2
Schur analysis and discrete analytic functions: Rational functions and co-isometric realizations
Published in Linear algebra and its applications (15-10-2023)“…We define and study rational discrete analytic functions and prove the existence of a coisometric realization for discrete analytic Schur multipliers…”
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3
Discrete analytic functions, structured matrices and a new family of moment problems
Published in Bulletin des sciences mathématiques (01-10-2022)“…Using Zeilberger generating function formula for the values of a discrete analytic function in a quadrant we make connections with the theory of structured…”
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4
On discrete analytic functions: Products, rational functions and reproducing kernels
Published in Journal of applied mathematics & computing (01-03-2013)“…We introduce a family of discrete analytic functions, called expandable discrete analytic functions, which includes discrete analytic polynomials, and define…”
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5
A new realization of rational functions, with applications to linear combination interpolation, the Cuntz relations and kernel decompositions
Published in Complex variables and elliptic equations (02-01-2016)“…We introduce the following linear combination interpolation problem (LCI), which in case of simple nodes reads as follows: given distinct numbers and complex…”
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6
Zero distribution of matrix polynomials
Published in Linear algebra and its applications (01-09-2007)“…The theory of finite dimensional reproducing kernel Krein spaces is exploited to obtain matrix analogues of the Schur–Cohn theorem and the Hermite theorem on…”
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7
Schur analysis and discrete analytic functions: Rational functions and co-isometric realizations
Published 07-11-2021“…We define and study rational discrete analytic functions and prove the existence of a coisometric realization for discrete analytic Schur multipliers…”
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8
Discrete analytic Schur functions
Published 07-06-2021“…We introduce the Schur class of functions, discrete analytic on the integer lattice in the complex plane. As a special case, we derive the explicit form of…”
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9
Carathéodory–Fejér interpolation in locally convex topological vector spaces
Published in Linear algebra and its applications (01-09-2009)“…We study Carathéodory–Herglotz functions whose values are continuous operators from a locally convex topological vector space which admits the factorization…”
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10
Carathéodory functions in the Banach space setting
Published in Linear algebra and its applications (01-09-2007)“…We prove representation theorems for Carathéodory functions in the setting of Banach spaces…”
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11
A Schur transformation for functions in a general class of domains
Published in Indagationes mathematicae (01-12-2012)“…In this paper we present a framework in which the Schur transformation and the basic interpolation problem for generalized Schur functions, generalized…”
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12
Operator Valued Functions with Pick Operators Having Negative Subspaces of Bounded Dimensions
Published in Complex analysis and operator theory (01-03-2009)“… Functions whose values are bounded linear Hilbert space operators (each operator may be defined on its own subspace of the ambient Hilbert space), the domain…”
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13
Rational discrete analytic functions on a rhombic lattice
Published 07-12-2023“…A novel basis of discrete analytic polynomials on a rhombic lattice is introduced and the associated convolution product is studied. A class of discrete…”
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14
SCHUR MULTIPLIERS AND DE BRANGES–ROVNYAK SPACES: THE MULTISCALE CASE
Published in Journal of operator theory (01-01-2009)“…We consider bounded linear operators acting on the ℓ2 space indexed by the nodes of a homogeneous tree. Using the Cuntz relations between the primitive shifts…”
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15
Generalized Schur Functions and Related de Branges-Rovnyak Spaces in the Banach Space Setting
Published in Integral equations and operator theory (01-12-2009)“… We study the analogues of de Branges-Rovnyak spaces in the Banach space case. An important role is played by self-adjoint operators from the dual of a Banach…”
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16
Rational hyperholomorphic functions in R 4
Published in Journal of functional analysis (01-04-2005)“…We introduce the notion of rationality for hyperholomorphic functions (functions in the kernel of the Cauchy–Fueter operator). Following the case of one…”
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17
Discrete analytic functions, structured matrices and a new family of moment problems
Published 24-03-2022“…Using Zeilberger generating function formula for the values of a discrete analytic function in a quadrant we make connections with the theory of structured…”
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18
Point Evaluation and Hardy Space on a Homogeneous Tree
Published in Integral equations and operator theory (01-09-2005)Get full text
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19
Deformations of Fuchsian Systems of Linear Differential Equations and the Schlesinger System
Published in Mathematical physics, analysis, and geometry (01-05-2006)Get full text
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Realization theorems for stationary multiscale systems
Published in Linear algebra and its applications (15-01-2006)“…We construct coisometric and quasi-coisometric realizations for transfer operators of multiscale causal stationary dissipative systems…”
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