Corollary
Tag 055T, permanent. Cite it as [Bourbaki, Tag 055T].
Algebra, chapter I, § 1. Laws of composition; associativity; commutativity
Let be an associative magma. The centralizer of any subset of is a stable subset of .
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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