Bourbaki

Exercise 14, § 7

Tag 02H1, permanent. Cite it as [Bourbaki, Tag 02H1].

Spectral Theories, I, p. 190

Give an example of a complex Hilbert space and of u∈L(E)u\in \mathscr{L}(E) such that ι(u)\iota (u) is not closed.

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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.