Bourbaki

Example 2

Tag 01M5, permanent. Cite it as [Bourbaki, Tag 01M5].

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

A continuous mapping which is open, or closed, or which possesses a continuous section, is strict. This follows from prop. 3 of TG, I, p. 32 and from prop. 9 of TG, I, p. 22.

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.