Bourbaki

Remark 2

Tag 024U, permanent. Cite it as [Bourbaki, Tag 024U].

Théories spectrales, chapter I, § 1. Spectres et caractères

If A≠{0}A\not=\{0\}, then Sp(λe\lambda e) ={λ}=\{\lambda \} for every λ∈K\lambda \in K.

Bourbaki sets the proof directly after the statement, and the corpus does not separate them, so what is above is the statement and its proof together.

Cited by

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Cites

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Machine translation of the English, by gpt-5.4, gpt-5-6-mini, against glossary version 34. Not checked by a person. That model is a cut down version of the one the rest of this language was written by.