Results 11 to 20 of about 150 (46)
Inequalities of Hardy-Littlewood-Polya type for functions of operators and their applications [PDF]
, 2015 In this paper, we derive a generalized multiplicative Hardy-Littlewood-Polya type inequality, as well as several related additive inequalities, for functions of operators in Hilbert spaces.
Babenko, Vladyslav +2 more
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Weighted projections into closed subspaces [PDF]
, 2013 In this paper we study $A$-projections, i.e. operators of a Hilbert space $\HH$ which act as projections when a seminorm is considered in $\HH$. $A$-projections were introduced by Mitra and Rao \cite{[MitRao74]} for finite dimensional spaces.
Corach, Gustavo +2 more
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Approximation results for a general class of Kantorovich type operators [PDF]
, 2014 We introduce and study a family of integral operators in the Kantorovich sense for functions acting on locally compact topological groups. We obtain convergence results for the above operators with respect to the pointwise and uniform convergence and in ...
Vinti, Gianluca, Zampogni, Luca
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Sard's approximation processes and oblique projections [PDF]
, 2009 Three problems arising in approximation theory are studied. These problems have already been studied by Arthur Sard. The main goal of this paper is to use geometrical compatibility theory to extend Sard's results and get characterizations of the sets of ...
Corach, Gustavo +2 more
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Best approximation by diagonal compact operators [PDF]
, 2013 We study the existence and characterization properties of compact Hermitian operators C on a separable Hilbert space H such that ||C|| is less or equal than || C + D ||, for all D in D(K(H)). This property is equivalent to || C || = min{||C+D||: D in D(K(
Bottazzi, Tamara, Varela, Alejandro
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Strongly convergent approximations to fixed points of total asymptotically nonexpansive mappings [PDF]
, 2008 In this work we prove a new strong convergence result of the regularized successive approximation method given by yn+1 = qnz0 + (1 − qn)T n yn, n = 1, 2, ..., where limn→∞ qn = 0 and X∞ n=1 qn = ∞, for T a total asymptotically nonexpansive ...
Alber, Yakov +2 more
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A philosophy for the modelling of realistic nonlinear systems [PDF]
, 2003 First published in Proceedings of the American Mathematical Society in volume 132, number 2, by the American Mathematical Society Copyright © 2003 American Mathematical SocietyA nonlinear dynamical system is modelled as a nonlinear mapping from a set of ...
Howlett, P., Pearce, C., Torokhti, A.
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Approximation of integral operators using product-convolution expansions [PDF]
, 2016 International audienceWe consider a class of linear integral operators with impulse responses varying regularly in time or space. These operators appear in a large number of applications ranging from signal/image processing to biology.
A Cohen +38 more
core +3 more sources
Minimal hermitian matrices with fixed entries outside the diagonal [PDF]
, 2008 We survey some results concerning the problem of finding the complex hermitian matrix or matrices of least supremum norm with variable diagonal. Some qualitative general results are given and more specific descriptions are shown for the 3 x 3 case.
Andruchow, Esteban +4 more
core
Multipliers for Continuous Frames in Hilbert Spaces
, 2012 In this paper we examine the general theory of continuous frame multipliers in Hilbert space. These operators are a generalization of the widely used notion of (discrete) frame multipliers.
Balazs, Peter +2 more
core +1 more source