𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Some functions reversing the order of positive operators

✍ Scribed by Josip Pečarić; Jadranka Mićić


Publisher
Elsevier Science
Year
2005
Tongue
English
Weight
238 KB
Volume
396
Category
Article
ISSN
0024-3795

No coin nor oath required. For personal study only.


📜 SIMILAR VOLUMES


Functions of Pseudo-Differential Operato
✍ Josefina Alvarez; Jorge Hounie 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 502 KB

The aim of this paper is to define functions of several commuting and non-commuting self-adjoint pseudo-differential operators of non-positive order, by means of the H. Weyl formula Given 1<p< , the pseudo-differential operators under consideration belong to the Ho rmander class L m \, $ , m &n(1&\

The Extreme Points of Order Intervals of
✍ W.L. Green; T.D. Morley 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 433 KB

Consider the order interval of operators \([0, A\}=\{X \mid 0 \leq X \leq A\}\). In finite dimensions (or if \(A\) is invertible) then the extreme points of \([0, A]\) are the shorted operators (generalized Schur complements) of \(A\). This is false in the general infinite dimensional case. We give

Approximation of Unbounded Functions by
✍ H. S. Kasana; H. Sollervall 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 293 KB

## Abstract A unified class of linear positive operators has been defined. Using these operators some approximation estimates have been obtained for unbounded functions. For particular linear positive operators these results sharpen and improve the earlier estimates due to Fuhua Cheng (J. Approx. T

Some aspects of the spectral theory of p
✍ Xiao-Dong Zhang 📂 Article 📅 1992 🏛 Springer Netherlands 🌐 English ⚖ 415 KB

We consider various aspects of the following problem: Let T be a positive operator on a Banach lattice such that a(T) = {1}. Does it follow that T >\_ 17

On Positive Definiteness of Some Functio
✍ Victor P Zastavnyi 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 271 KB

Let \ be a nonnegative homogeneous function on R n . General structure of the set of numerical pairs ($, \*), for which the function (1&\ \* (x)) $ + is positive definite on R n is investigated; a criterion for positive definiteness of this function is given in terms of completely monotonic function