Results 11 to 20 of about 3,477,811 (272)
Norm and Numerical Radius Inequalities for Two Linear Operators in Hilbert Spaces [PDF]
, 2008 Some inequalities for the norm and numerical radius of two bounded linear operators in Hilbert spaces are ...
Dragomir, Sever S
core +5 more sources
New Inequalities of the Kantorovich Type for Bounded Linear Operators in Hilbert Spaces [PDF]
, 2006 Some new inequalities of the Kantorovich type are established. They hold for larger classes of operators and subsets of complex numbers than considered before in the literature and provide refinements of the classical results in the case when the ...
Dragomir, Sever S
core +6 more sources
Some Inequalities for Commutators of Bounded Linear Operators in Hilbert Spaces [PDF]
, 2008 Some new inequalities for commutators that complement and in some instances improve recent results obtained by F. Kittaneh in 'Inequalities for commutators of positive operators' (2007) and 'Norm inequalities for commutators of Hilbert space operators ...
Dragomir, Sever S
core +6 more sources
Recurrent Linear Operators [PDF]
Complex Analysis and Operator Theory, 2013 38 pages; final version, incorporates referee's report; to appear in Complex Anal.
Costakis, George +2 more
openaire +4 more sources
Some inequalities for the Euclidean operator radius of two operators in Hilbert spaces [PDF]
, 2006 Some sharp bounds for the Euclidean operator radius of two bounded linear operators in Hilbert spaces are given. Their connection with Kittaneh’s recent results which provide sharp upper and lower bounds for the numerical radius of linear operators are ...
Dragomir, Sever S., Dragomir, Sever S
core +7 more sources
Maximality of linear operators [PDF]
Rendiconti del Circolo Matematico di Palermo Series 2, 2018 We present maximality results in the setting of non necessarily bounded operators. In particular, we discuss and establish results showing when the "inclusion" between operators becomes a full equality.
Meziane, Mohammed +1 more
openaire +3 more sources
Norm and Numerical Radius Inequalities for a Product of Two Linear Operators in Hilbert Spaces [PDF]
, 2006 The main aim of the present paper is to establish some norm and numerical radius inequalities for the composite operator BA under suitable assumptions for the transform Cα ,β (T) := (T∗ −α I)(β I−T) , where α ,β ∈ C and T ∈ B(H), of the operators ...
S. S. Dragomir +2 more
core +2 more sources
Pseudospectra of Linear Operators [PDF]
SIAM Review, 1997 This overview is a companion to the author's article [Pitman Res. Notes Math. Ser. 260, 234-266 (1992; Zbl 0798.15005)], where the matrix case was treated. In this paper newer results on the pseudospectrum of operators are presented and thoroughly discussed. It contains ten examples for pseudospectra of bounded and unbounded operators, e.g.
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Some Inequalities of the Grüss Type for the Numerical Radius of Bounded Linear Operators in Hilbert Spaces [PDF]
, 2008 Some inequalities of the Grüss Type type for the numerical radius of bounded linear operators in Hilbert spaces are ...
Dragomir, Sever S
core +5 more sources
Hypercausal Linear Operators [PDF]
SIAM Journal on Control and Optimization, 1984 Several different classes of hypercausal operators appear in linear system theory. This paper provides, for each pair of classes of hypercausal operators, necessary and sufficient conditions on the Hilbert resolution space to guarantee equality of the classes. In addition, the effect of similarity transforms on each class is studied.
openaire +2 more sources