Corollary 2
Tag 0749, permanent. Cite it as [Bourbaki, Tag 0749].
Algebra, chapter VII, § 4. Finitely generated modules over a principal ideal domain
— Any finite abelian group G whose order is not divisible by the square of any integer is cyclic. Let us keep to the notation of Th. 3. Then since G is finite, and , for otherwise the order of G would be divisible by . Hence G is cyclic.
Bourbaki puts the proof directly after the statement, so what is above is the statement and its proof together.
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