Bourbaki

Exercise 16, § 4

Tag 0350, permanent. Cite it as [Bourbaki, Tag 0350].

Spectral Theories, IV, p. 348

Find an example which shows that the conclusion of Prop. 21 of IV, p. 251, is not valid in general for the bounded components of the spectrum.

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Machine translation of the English, by gpt-5.4. Not checked by a person.