Bourbaki

Exercise 1, § 6

Tag 02F4, permanent. Cite it as [Bourbaki, Tag 02F4].

Spectral Theories, I, p. 180

Find a unital involutive Banach algebra A and a unit element u∈Au\in A such that ∥u∥≠1\|u\| \not= 1.

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Machine translation of the English, by gpt-5-6-mini. Not checked by a person. That model is a cut down version of the one the rest of this language was written by.