Proposition 6
Tag 0BYE, permanent. Cite it as [Bourbaki, Tag 0BYE].
General Topology, chapter VII, § 1. Subgroups and quotient groups of $\mathbf{R}^n$
For every subgroup of , we have .
Bourbaki puts the proof directly after the statement, so what is above is the statement and its proof together.
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Cites
Nothing.