Bourbaki

Example 1

Tag 022W, permanent. Cite it as [Bourbaki, Tag 022W].

Topologie algébrique, chapter IV, § 4. Théorie de la descente

The theorem applies when the mapping ff is étale and surjective.

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

Nothing.

Cites

Nothing.

Machine translation of the English, by gpt-5-6-mini, gpt-5.4, 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.