Friedrichs extension, Krein extension
The Friedrichs extension and the Krein extension of a positive operator in a Krein space are characterized in terms of their spectral functions in a Krein space.
Integral Equations and Operator Theory
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This is the author's post referred version of the article. The final publication is available at Springer via http://dx.doi.org/10.1007/BF01194557
Ćurgus, Branko, "Definitizable Extensions of Positive Symmetric Operators in a Krein Space" (1989). Mathematics. 74.
Subjects - Topical (LCSH)
Kreĭn spaces; Symmetric operators; Integral closure
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