Journal of Operator Theory

Volume 38, Issue 2, Fall 1997 pp. 225-242.

Noncompactness measure invariance of the index

Authors: Calin-Grigore Ambrozie
Author institution: Institute of Mathematics of the Romanian Academy, P.O. Box 1-764, 70700 Bucharest, ROMANIA. E-mail: cambroz@imar.ro

Summary: We state some new results of perturbations with respect to the noncompactness measure, concerning Fredholm-type objects in Banach spaces. In particular, we solve the problem of the invariance of the index in this context. We generalize some related results to the case of the variable domains.

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