Bourbaki

Example 1

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

Topologie algébrique, chapter III, § 1. Homotopies, homéotopies

The empty topological space is homotopy equivalent only to itself.

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, gpt-5-6-mini, gpt-5-mini, 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.