Corollary 1
Tag 07U3, permanent. Cite it as [Bourbaki, Tag 07U3].
Topological Vector Spaces, IV, p. 25, § 3. Dual of a Fréchet space
Let be a locally convex metrizable space. Every precompact subset of is contained in the closed convex balanced envelope of the set of points of a sequence converging to 0.
This follows from the fact that the topologies and are identical, on account of prop. 2 of III, p. 15.
Bourbaki puts the proof directly after the statement, so what is above is the statement and its proof together.
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Nothing.