Remark 2
Tag 003C, permanent. Cite it as [Bourbaki, Tag 003C].
Algebra, VIII, p. 46, § 3. Simple Modules
We can give an example of a noncommutative ring A and two distinct maximal left ideals and of A such that the A-modules and are isomorphic (VIII, p. 52, Exercise 3).
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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Nothing.