Remark 1

Tag 01U1, permanent. Cite it as [Bourbaki, Tag 01U1].

Topologie algébrique, chapter II, § 3. Groupoïdes

The homomorphism $\mu_a$ is the inverse isomorphism of $\lambda$ .

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.

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