Bourbaki

Corollary 2

Tag 07KM, permanent. Cite it as [Bourbaki, Tag 07KM].

Topological Vector Spaces, chapter II, § 8. Complex locally convex spaces

— Let V be a vector subspace of a complex locally convex space E and f be a (complex) linear form defined and continuous in V; then there exists a continuous linear form f1f_1 defined in E and extending f. If E is normed there exists such a form f1f_1 that also satisfies ∥f1∥=∥f∥\|f_1\| = \|f\|.

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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Transcribed from the printed volume. Not translated.