Bourbaki

Remark

Tag 01MD, permanent. Cite it as [Bourbaki, Tag 01MD].

Topologie algébrique, chapter I, § 1. Produits fibrés et carrés cartésiens

A closed mapping is not necessarily universally strict (cf. TG, I, p. 96, exerc. 6).

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-5.4, against glossary version 34. Not checked by a person.