Bourbaki

Corollary 1

Tag 05TU, permanent. Cite it as [Bourbaki, Tag 05TU].

Algebra, chapter II, § 7. Vector spaces

If E′E' is a submodule of EE, E(K)′E'_{(K)} is canonically identified with a vector subspace of E(K)E_{(K)} and (E/E′)(K)(E/E')_{(K)} with E(K)/E(K)′E_{(K)}/E'_{(K)}.

It suffices to apply Proposition 27 to the exact sequence

0→E′→E→E/E′→0. 0 \to E' \to E \to E/E' \to 0.

Bourbaki puts the proof directly after the statement, so what is above is the statement and its proof together.

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Cites

Transcribed from the printed edition, 1998, Springer. Not translated.