Corollary 2
Tag 0574, permanent. Cite it as [Bourbaki, Tag 0574].
Algebra, chapter I, § 2. Identity element; cancellable elements; invertible elements
In a monoid the inverse of a central invertible element is a central element.
Bourbaki puts the proof directly after the statement, so what is above is the statement and its proof together.
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Cites
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