Results 71 to 80 of about 40,951 (187)

Approximating Derivatives by a Class of Positive Linear Operators

International Journal of Analysis and Applications, 2013
Some Direct Theorems for the linear combinations of a new class of positive linear operators have been obtained for both, pointwise and uniform simultaneous approximations.
Bramha Dutta Pandey, B. Kunwar
doaj   +2 more sources

Preservers for the p-Norm of Linear Combinations of Positive Operators

Abstract and Applied Analysis, 2014
We describe the structure of those transformations on certain sets of positive operators which preserve the p-norm of linear combinations with given nonzero real coefficients. These sets are the collection of all positive pth Schatten-class operators and
Gergő Nagy
doaj   +1 more source

Eventually Cone-Positive Semigroups of Linear Operators. [PDF]

, 2016
We extend the theory of eventually nonnegative, eventually-exponentially nonnegative matrices and eventually positive semigroups to eventually cone-positive semigroups of linear operators on Banach lattices. We assume all the cones are proper and cone
Kasigwa, Michael
core   +1 more source

A Generalization of Lacunary Equistatistical Convergence of Positive Linear Operators

Abstract and Applied Analysis, 2013
In this paper we consider some analogs of the Korovkin approximation theorem via lacunary equistatistical convergence. In particular we study lacunary equi-statistical convergence of approximating operators on spaces, the spaces of all real valued ...
Yusuf Kaya, Nazmiye Gönül
doaj   +1 more source

Chebyshev subspaces and convergence of positive linear operators [PDF]

, 1973
A theorem of Korovkin states that a sequence of positive linear operators on C [ a , b ] C[a,b] converges strongly to the identity if and only if convergence holds on a three-dimensional ...
C. A. Micchelli
core   +1 more source

Reverses of Young and Heinz inequalities for positive linear operators

Journal of Inequalities and Applications, 2016
Let A, B be invertible positive operators on a Hilbert space H. We present some improved reverses of Young type inequalities, in particular, ( 1 − ν ) 2 ν ( A ∇ B ) + ( 1 − ν ) 2 ( 1 − ν ) H 2 ν ( A , B ) ≥ 2 ( 1 − ν ) ( A ♯ B ) $$ (1-\nu)^{2\nu}(A\nabla
S Malekinejad, S Talebi, AG Ghazanfari
doaj   +1 more source

A New Proof for a Rolewicz's Type Theorem: An Evolution Semigroup Approach [PDF]

, 2001
Let $varphi$ be a positive and non-decreasing function defined on the real half-line and $mathcal{U}$ be a strongly continuous and exponentially bounded evolution family of bounded linear operators acting on a Banach space. We prove that if $varphi$ and $
Constantin Buse, S. S. Dragomir, Sever S. Dragomir, Dragomir, Sever S, C. Buse, Buşe, Constantin   +5 more
core  

Paratransitive algebras of linear operators [PDF]

In this article we study a natural weakening – which we refer to as paratransitivity – of the well-known notion of transitivity of an algebra AA of linear operators acting on a finite-dimensional vector space VV. Given positive integers k and m, we shall

core   +1 more source

Infinitely Many Specific Fuzzy Neural Network Operators Treated as Fuzzy Positive Linear Operators

Mathematics
Basic fuzzy multicomposite neural network operators are interpreted as fuzzy positive linear operators, and the related general fuzzy theory is applied. These fuzzy operators are defined by the composition of seven well-known activation functions. We are
George A. Anastassiou
doaj   +1 more source

Transformation of the second order modulus by positive linear operators

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2015
We obtain estimates for the transformation of the second order modulus of continuity by positive linear operators which satisfy certain conditions, which are common to a large class of approximation operators.
Pǎltǎnea Radu, Stan Gabriel
doaj   +1 more source