Corollary 2
Tag 05N7, permanent. Cite it as [Bourbaki, Tag 05N7].
Algebra, chapter II, § 2. Modules of linear mappings. Duality
Let C be a commutative ring and E, F two finitely generated projective C-modules; then is a finitely generated projective C-module.
It may be assumed that there are two finitely generated free C-modules M, N such that ; it follows from § 1, no. 6, Corollary 1 to Proposition 6 that is finitely generated and free and on the other hand that is isomorphic to
whence the corollary.
Bourbaki puts the proof directly after the statement, so what is above is the statement and its proof together.
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