PERTURBATION OF SEMI-FREDHOLM OPERATORS ON PRODUCTS OF BANACH SPACES

被引：0
|
作者：
Gimenez, Jose [1 ]
Gonzalez, Manuel [2 ]
Martinez-Abejon, Antonio [3 ]
机构：
[1] Univ Los Andes, Dept Matemat, Merida 5101, Venezuela
[2] Univ Cantabria, Dept Matemat, E-39071 Santander, Spain
[3] Univ Oviedo, Dept Matemat, E-33007 Oviedo, Spain
来源：
JOURNAL OF OPERATOR THEORY | 2012年 / 68卷 / 02期
关键词：
Semi-Fredholm operator; strictly singular; strictly cosingular; perturbation class; SUBSPACES;
D O I：
暂无
中图分类号：
O1 [数学];
学科分类号：
0701 ; 070101 ;
摘要：
We show new examples of Banach spaces X and Y for which the component P Phi(+) (X, Y) of the perturbation class for the upper semi-Fredholm operators coincides with the strictly singular operators, or the component P Phi(-)(X, Y) of the perturbation class for the lower semi-Fredholm operators coincides with the strictly cosingular operators. We also show new examples for which the equalities fail.
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页码：501 / 514
页数：14
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