Abstract
In this chapter, we introduce the basic theory of operators on Hilbert space, including unbounded operators. Topics include adjoints, operator closure, symmetry and self-adjointness, and compact operators.
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Borthwick, D. (2020). Operators. In: Spectral Theory. Graduate Texts in Mathematics, vol 284. Springer, Cham. https://doi.org/10.1007/978-3-030-38002-1_3
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DOI: https://doi.org/10.1007/978-3-030-38002-1_3
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