Preservation of the Range under Perturbations of an Operator
نویسندگان
چکیده
A 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.
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تاریخ انتشار 1997