Remark 2

Tag 0339, permanent. Cite it as [Bourbaki, Tag 0339].

Théories spectrales, chapter IV, § 4. Opérateurs partiels

A self-adjoint partial operator $u$ is essentially self-adjoint (cf. prop. 8).

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.

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