Preservation of the Range Under Perturbations of an OperatorProceedings of the American Mathematical Society
AbstractA sufficient condition for the stability of the range of a positive operator in a Hilbert space is given. As a consequence, we get a class of additive perturbations which preserve regularity of the critical point 0 of a positive operator in a Krein space.
Citation InformationBranko Ćurgus and Branko Najman. "Preservation of the Range Under Perturbations of an Operator" Proceedings of the American Mathematical Society Vol. 125 Iss. 9 (1997) p. 2627 - 2631
Available at: http://works.bepress.com/branko_curgus/5/