Bourbaki

Corollary 2

Tag 01X5, permanent. Cite it as [Bourbaki, Tag 01X5].

Topologie algébrique, chapter III, § 2. Homotopie et chemins

Let B be a locally path-connected topological space and let E be a B-space étalé. The space E is locally path-connected. If it is connected, it is path-connected.

The first assertion follows immediately from def. 4 and the definition of an étale mapping (I, p. 28, def. 2). The second follows from it by prop. 7.

In order that a topological space X be locally path-connected, it is necessary and sufficient that every path-connected component of an open set of X be an open set of X (cf. I, p. 85, proof of prop. 11). If the space X is locally path-connected, every point of X therefore possesses a fundamental system of open path-connected neighbourhoods.

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-mini, gpt-5-6, 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.