The Functional Analytic Part: Two Operators in Different Hilbert Spaces
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In this chapter, we develop a general framework in order to deal with operators acting in different Hilbert spaces, but being “close” to each other (in a sense to be made precise). In particular, we generalise the concept of norm resolvent convergence.
KeywordsHilbert Space Quadratic Form Discrete Spectrum Essential Spectrum Piecewise Smooth Boundary
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