Results 61 to 70 of about 937,852 (212)

An extension of a theorem of Sahab, Khan, and Sessa

International Journal of Mathematics and Mathematical Sciences, 2001
A fixed point theorem of Fisher and Sessa is generalized to locally convex spaces and the new result is applied to extend a recent theorem on invariant approximation of Sahab, Khan, and Sessa.
A. R. Khan, N. Hussain
doaj   +1 more source

Approximation Theorems and Fixed Point Theorem in Cones [PDF]

Proceedings of the American Mathematical Society, 1988
In this paper, we investigate the validity of an interesting theorem of Fan [ 3 , Theorem 2] in cones. We prove that it is true for a continuous condensing map defined on a closed ball in cones.
openaire   +1 more source

The Weak Approximation Theorem for Valuations

, 1999
(1) We prove a Weak Approximation Theorem for valuations that are not necessarily independent.(2) We study the existence of intersections of finite families of valuation rings having a prescribed divisibility group and prescribed residue ...
Lequain, Yves, de Souza Doering, Ada Maria   +1 more
core   +1 more source

A Korovkin-Type Approximation Theorem and Power Series Method [PDF]

, 2016
WOS: 000376103600015In this paper, using power series methods we give an abstract Korovkin type approximation theorem for a sequence of positive linear operators mapping into ...
Emre Taş, Ozguc, Ilknur, Tas, Emre, İlknur Özgüç   +3 more
core   +1 more source

The approximation of bivariate functions by modified bivariate operators and GBS operators associated

Journal of Numerical Analysis and Approximation Theory, 2012
In this paper we demonstrate a Voronovskaja-type theorem and approximation theorem for a class of modified operators and Generalized Boolean Sum (GBS) associated operators obtained (see (3)) from given operators.
Ovidiu T. Pop
doaj   +2 more sources

Approximation Properties of λ-Gamma Operators Based on q-Integers

Journal of Function Spaces, 2020
In the present paper, we will introduce λ-Gamma operators based on q-integers. First, the auxiliary results about the moments are presented, and the central moments of these operators are also estimated.
Wen-Tao Cheng, Xiao-Jun Tang
doaj   +1 more source

An extrapolation theorem for nonlinear approximation and its applications ଁ [PDF]

, 2006
We prove an extrapolation theorem for the nonlinear m-term approximation with respect to a system of functions satisfying very mild conditions. This theorem allows us to prove endpoint Lp-Lq estimates in nonlinear approximation.
Feng Dai
core  

An extension of a best approximation theorem

International Journal of Mathematics and Mathematical Sciences, 1996
In this paper an extension of a theorem of Prolla is given and several interesting corollaries are derived. Fixed point results are also given in the end.
A. Carbone
doaj   +1 more source

Solving Discrete Systems of Nonlinear Equations [PDF]

In this paper we study the existence problem of a zero point of a function defined on a finite set of elements of the integer lattice Zn of the n-dimensional Euclidean space IRn.
Laan, G. van der, Yang, Z.F., Talman, A.J.J.   +2 more
core  

A Korovkin Type Approximation Theorem and Its Applications [PDF]

, 2014
We present a Korovkin type approximation theorem for a sequence of positive linear operators defined on the space of all real valued continuous and periodic functions via A-statistical approximation, for the rate of the third order Ditzian-Totik modulus ...
Malik Saad Al-Muhja
core   +1 more source