Example

Tag 0AZN, permanent. Cite it as [Bourbaki, Tag 0AZN].

General Topology, chapter I, § 1. Open sets, neighbourhoods, closed sets

\* We shall see in Chapter IV, § 1 that the set of rational numbers and its complement are dense on the real line. \* In a discrete space $X$ the only dense subset of $X$ is $X$ itself. On the other hand, every non-empty subset of $X$ is dense in the topology on $X$ for which the only open sets are $\varnothing$ and $X$ .

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

Cited by

Nothing.

Cites

Chapter IV, § 1