Corollary 1
Tag 01ZA, permanent. Cite it as [Bourbaki, Tag 01ZA].
Topologie algébrique, chapter III, § 4. Homotopie et revêtements
The mapping is a covering.
This follows from I, p. 71, cor. 2 of prop. 1.
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.