Results 41 to 50 of about 317,488 (309)

On Strong Approximation of Functions by Certain Linear Operators [PDF]

, 2004
This note is motivated by the results on the strong approximation of 2Π-periodic functions by means of trigonometric Fourier series.In this note is investigated certain class of positive linear operators in the polynomial weighted spaces.
Rempulska, Lucyna, Skorupka, Mariola
core   +1 more source

Certain approximation properties of Brenke polynomials using Jakimovski–Leviatan operators

Journal of Inequalities and Applications, 2021
In this article, we establish the approximation by Durrmeyer type Jakimovski–Leviatan operators involving the Brenke type polynomials. The positive linear operators are constructed for the Brenke polynomials, and thus approximation properties for these ...
Shahid Ahmad Wani, M. Mursaleen, Kottakkaran Sooppy Nisar   +2 more
doaj   +1 more source

Effects of two-site composite excitations in the Hubbard model

, 2004
The electronic states of the Hubbard model are investigated by use of the Composite Operator Method. In addition to the Hubbard operators, two other operators related with two-site composite excitations are included in the basis.
A Avella, Avella, Becca, F Mancini, Ishihara, Mancini, Mancini, Mancini, S Odashima   +8 more
core   +1 more source

Approximation by Genuine $q$-Bernstein-Durrmeyer Polynomials in Compact Disks in the case $q > 1$ [PDF]

, 2014
This paper deals with approximating properties of the newly defined $q$-generalization of the genuine Bernstein-Durrmeyer polynomials in the case $q>1$, whcih are no longer positive linear operators on $C[0,1]$. Quantitative estimates of the convergence,
Mahmudov, Nazim I.
core   +3 more sources

On the degree of approximation by linear positive operators

Journal of Approximation Theory, 1976
B. Mond
openaire   +3 more sources

The Θ-transformation of certain positive linear operators

International Journal of Mathematics and Mathematical Sciences, 1996
The intention of this paper is to describe a construction method for a new sequence of linear positive operators, which enables us to get a pointwise order of approximation regarding the polynomial summator operators which have “best” properties of ...
Aleandru Lupaş, Detlef H. Mache
doaj   +1 more source

Approximation by positive operators in the space \(C^{(p)}([a,b])\)

Journal of Numerical Analysis and Approximation Theory, 1989
Not available.
Francesco Altomare, Ioan Raşa
doaj   +2 more sources

Continuity of the von Neumann entropy

, 2009
A general method for proving continuity of the von Neumann entropy on subsets of positive trace-class operators is considered. This makes it possible to re-derive the known conditions for continuity of the entropy in more general forms and to obtain ...
A. Clausing, A. Uhlmann, A. Wehrl, A. Wehrl, A.D. Joffe, A.S. Holevo, A.S. Holevo, A.S. Holevo, C.H. Bennett, G. Lindblad, G.F. Dell’Antonio, K. Parthasarathy, M. E. Shirokov, M. Ohya, M. Owari, M. Ozawa, M.A. Nielsen, M.B. Plenio, M.E. Shirokov, M.E. Shirokov, O. Bratteli, P.M. Alberti, R. Grzaslewicz, R. O’Brien, R. Rockafellar, S. Papadopoulou, V.Yu. Protasov   +26 more
core   +1 more source

Prolonged Corrected QT Interval as an Early Electrocardiographic Marker of Cyclophosphamide‐Induced Cardiotoxicity in Pediatric Hematology and Oncology Patients

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Cyclophosphamide (CY) is associated with potentially fatal cardiotoxicity, yet no electrocardiographic indices have been established for early detection of CY‐induced cardiomyopathy. This study aimed to determine whether corrected QT interval (QTc) prolongation can predict early onset of CY‐related cardiac dysfunction in pediatric ...
Junpei Kawamura, Kentaro Ueno, Takuro Nishikawa, Yoshihiro Takahashi, Koji Nakae, Yasuhiro Okamoto   +5 more
wiley   +1 more source

Approximation by Semigroups of Spherical Operators

, 2011
This paper discusses the approximation by %semigroups of operators of class ($\mathscr{C}_0$) on the sphere and focuses on a class of so called exponential-type multiplier operators.
Cao, Feilong, Wang, Yuguang
core   +1 more source