Bourbaki

Exercise 8, § 1

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

Spectral Theories, III, p. 106

Construct an example of a non-compact endomorphism uu of a Hilbert space E such that u2u^2 is compact.

Solution

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Cites

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