Some properties of pre-quasi operator ideal of type generalized Cesaro sequence space defined by weighted means

被引:7
作者
Bakery, Awad A. [1 ,2 ]
Mohammed, Mustafa M. [1 ,3 ]
机构
[1] Univ Jeddah, Coll Sci & Arts Khulis, Dept Math, Jeddah, Saudi Arabia
[2] Ain Shams Univ, Fac Sci, Dept Math, Box 1156, Cairo 11566, Abbassia, Egypt
[3] Sudan Univ Sci & Technol, Dept Stat, Fac Sci, Khartoum, Sudan
来源
OPEN MATHEMATICS | 2019年 / 17卷
关键词
pre-quasi operator ideal; s-numbers; generalized Cesaro sequence space; weighted means; simple Banach space;
D O I
10.1515/math-2019-0135
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
Let E be a generalized Cesaro sequence space defined by weighted means and by using s-numbers of operators from a Banach space X into a Banach space Y. We give the sufficient (not necessary) conditions on E such that the components S-E(X, Y) := {T is an element of L(X, Y) : ((S-n(T))n=0 infinity is an element of E}, of the class S-E form pre-quasi operator ideal, the class of all finite rank operators are dense in the Banach pre-quasi ideal S-E, the pre-quasi operator ideal formed by the sequence of approximation numbers is strictly contained for different weights and powers, the pre-quasi Banach Operator ideal formed by the sequence of approximation numbers is small and the pre-quasi Banach operator ideal constructed by s-numbers is simple Banach space. Finally the pre-quasi operator ideal formed by the sequence of s-numbers and this sequence space is strictly contained in the class of all bounded linear operators, whose sequence of eigenvalues belongs to this sequence space.
引用
收藏
页码:1703 / 1715
页数:13
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