Bourbaki

Definition 2

Tag 0BG5, permanent. Cite it as [Bourbaki, Tag 0BG5].

General Topology, chapter II, § 4. Relations between uniform spaces and compact spaces

A uniform space XX is said to be precompact if its Hausdorff completion X^\hat{X} is compact. A subset AA of a uniform space XX is said to be a precompact subset if the uniform subspace AA of XX is precompact.

Thus a subset AA of a uniform space XX is precompact if and only if the closure of i(A)i(A) in X^\hat{X} is compact (i:X→X^i : X \to \hat{X} being the canonical map) (§ 3, no. 9, Proposition 18, Corollary 1).

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

Cited by

Nothing.

Cites

Transcribed from the printed volume. Not translated.