Journal of Operator Theory, Vol. 58, No. 2 (Fall 2007), pp. 415-440 (26 pages) In this paper the well-known result that a definitizable operator in a Krein space remains definitizable after a finite ...
This is a preview. Log in through your library . Abstract A new characterization of the positive self-adjoint extensions of symmetric operators, T0, is presented, which is based on the Friedrichs ...
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