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Spectrum (functional analysis)
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===Peripheral spectrum=== The peripheral spectrum of an operator is defined as the set of points in its spectrum which have modulus equal to its spectral radius.<ref name="Zaanen">{{cite book|last1=Zaanen|first1=Adriaan C.|title=Introduction to Operator Theory in Riesz Spaces|date=2012|publisher=Springer Science & Business Media|isbn=9783642606373|page=304|url=https://books.google.com/books?id=cgvpCAAAQBAJ&q=Peripheral+spectrum&pg=PA304|access-date=8 September 2017|language=en}}</ref>
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