Abstract
This chapter introduces the notion of the spectrum of an operator (possibly unbounded) on a Hilbert space. The theory of the resolvent operator is developed and used to establish basic properties of the spectrum.
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Borthwick, D. (2020). Spectrum and Resolvent. In: Spectral Theory. Graduate Texts in Mathematics, vol 284. Springer, Cham. https://doi.org/10.1007/978-3-030-38002-1_4
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DOI: https://doi.org/10.1007/978-3-030-38002-1_4
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