In mathematics, the resolvent formalism is a technique for applying methods from complex analysis to the study of the spectrum of operators on Banach spaces and more general spaces. Formal justification for its manipulations is found within the framework of holomorphic functional calculus. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
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1. Resolvent Formalism (Wikipedia)
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