Results 21 to 30 of about 554 (59)

A note on a camouflage pursuit problem [PDF]

open access: yes, 2010
The version available is a preprint of the full and final published article which is accessible at the link below.Copyright © The author 2010. Published by Oxford University Press; all rights reserved.
Rawlins, AD
core   +1 more source

On relationships between two linear subspaces and two orthogonal projectors

open access: yesSpecial Matrices, 2019
Sum and intersection of linear subspaces in a vector space over a field are fundamental operations in linear algebra. The purpose of this survey paper is to give a comprehensive approach to the sums and intersections of two linear subspaces and their ...
Tian Yongge
doaj   +1 more source

C-symmetric operators and reflexivity

open access: yes, 2015
We study subspaces of all C -symmetric operators. Description of the preanihilator of all C -symmetric operators is given. It is shown that the subspace of all C -symmetric operators is transitive and 2-hyperreflexive. Mathematics subject classification (
K. Kliś-Garlicka, M. Ptak
semanticscholar   +1 more source

On a class of shift-invariant subspaces of the Drury-Arveson space

open access: yesConcrete Operators, 2018
In the Drury-Arveson space, we consider the subspace of functions whose Taylor coefficients are supported in a set Y⊂ ℕd with the property that ℕ\X + ej ⊂ ℕ\X for all j = 1, . . . , d.
Arcozzi Nicola, Levi Matteo
doaj   +1 more source

Bishop's property (β), hypercyclicity and hyperinvariant subspaces

open access: yes, 2014
The question whether every operator on H has an hyperinvariant subspace is one of the most difficult problems in operator theory. The purpose of this paper is to make a beginning on the hyperinvariant subspace problems for another class of operators ...
S. Mécheri
semanticscholar   +1 more source

On supercyclicity for abelian semigroups of matrices on ℝ^n

open access: yes, 2018
We give a complete characterization of supercylicity for abelian semigroups of matrices on Rn , n 1 . We solve the problem of determining the minimal number of matrices over R which form a supercyclic abelian semigroup on Rn . In particular, we show that
Salah Herzi, H. Marzougui
semanticscholar   +1 more source

Ultrasound-Assisted Synthesis for the Control of Silver Nanoparticle Size: A Preliminary Study on the Influence of Pressure and pH

open access: yesCondensed Matter
The use of plasmonic nanoparticles for biosensor technology is dependent on nanoparticle size and morphology. This study determined the effect of pH and pressure on synthesizing silver nanoparticle size. In Method 1, a mixture of NaBH4 and sodium citrate
Paula Riascos   +3 more
doaj   +1 more source

Inner multipliers and Rudin type invariant subspaces

open access: yes, 2015
Let $\mathcal{E}$ be a Hilbert space and $H^2_{\mathcal{E}}(\mathbb{D})$ be the $\mathcal{E}$-valued Hardy space over the unit disc $\mathbb{D}$ in $\mathbb{C}$.
Chattopadhyay, Arup   +2 more
core   +1 more source

A Review for the Design and Optimization of Catalysts: The Use of Statistics as a Powerful Tool for Literature Analysis

open access: yesChemistry
In this study, a statistical analysis of results reported in the literature was conducted through a 2n experimental design on the synthesis of bifunctional catalysts used in the production of lighter fuels, aiming for optimization while considering ...
Tatiana Martinez   +3 more
doaj   +1 more source

Boundary behavior of functions in the de Branges--Rovnyak spaces

open access: yes, 2008
This paper deals with the boundary behavior of functions in the de Branges--Rovnyak spaces. First, we give a criterion for the existence of radial limits for the derivatives of functions in the de Branges--Rovnyak spaces.
Fricain, Emmanuel, Mashreghi, Javad
core   +3 more sources

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