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• W1979942146 abstract "Motivated by energy space representation of Dirac operators, in the sense of K. Friedrichs, we recently introduced the notion of closely embedded Kreĭn spaces. These spaces are associated to unbounded selfadjoint operators that play the role of kernel operators, in the sense of L. Schwartz, and they are special representations of induced Kreĭn spaces. In this article we present a canonical representation of closely embedded Kreĭn spaces in terms of a generalization of the notion of operator range and obtain a characterization of uniqueness. When applied to Dirac operators, the results differ according to a mass or a massless particle in a dramatic way: in the case of a particle with a nontrivial mass we obtain a dual of a Sobolev type space and we have uniqueness, while in the case of a massless particle we obtain a dual of a homogenous Sobolev type space and we lose uniqueness." @default.
• W1979942146 created "2016-06-24" @default.
• W1979942146 creator A5049884515 @default.
• W1979942146 creator A5063575646 @default.
• W1979942146 date "2011-04-01" @default.
• W1979942146 modified "2023-10-18" @default.
• W1979942146 title "Closely embedded Kreĭn spaces and applications to Dirac operators" @default.
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• W1979942146 doi "https://doi.org/10.1016/j.jmaa.2010.10.059" @default.
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