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arXiv 2006.05802math.FA
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The perturbation classes problem for subprojective and superprojective Banach spaces

Manuel González, Javier Pello, Margot Salas-Brown

英文摘要:

We show that the perturbation class for the upper semi-Fredholm operators between two Banach spaces X and Y coincides with the strictly singular operators when X is subprojective and that the perturbation class for the lower semi-Fredholm operators coincides with the strictly cosingular operators when Y is superprojective. Similar results were previously obtained under stronger conditions for X and Y.

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