Physics – Mathematical Physics
Scientific paper
2009-04-01
Physics
Mathematical Physics
38 pages
Scientific paper
The paper offers a self-consistent account of the spectral boundary value problems developed from the perspective of general theory of linear operators in Hilbert spaces. An abstract form of spectral boundary value problem with a generalized boundary condition is introduced and results on its solvability complemented by representations of weak and strong solutions are obtained. The question of existence of a closed linear operator defined by a given boundary condition and description of its domain is studied in detail. This question is addressed on the basis of a version of Krein's resolvent formula derived from the obtained representations for solutions. Usual resolvent identities for two operators associated with two different boundary conditions are written in terms of the so called M-operator and closed linear operators defining these conditions. Two examples illustrate the abstract core of the paper. Other applications to the theory of partial differential operators and to the mathematical physics are outlined.
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