Corollary 1
Tag 0CCK, permanent. Cite it as [Bourbaki, Tag 0CCK].
General Topology, chapter X, § 2. Equicontinuous sets
Let be a topological (resp. uniform) space, let be a Hausdorff uniform space and let be an equicontinuous (resp. uniformly equicontinuous) subset of . Suppose that is relatively compact in for each . Then is relatively compact in with respect to the topology of compact (resp. precompact) convergence.
Let be the closure of in . is equicontinuous (resp. uniformly equicontinuous) (no. 3, Proposition 6). Moreover, we have (§ 1, no. 2, Remark 6) and therefore is also relatively compact; hence Theorem 2 shows that is precompact with respect to -convergence, where denotes the set of all compact (resp. precompact) subsets of . Moreover, since is compact, and therefore complete, is complete with respect to the uniformity of pointwise convergence (Chapter II, § 3, no. 5, Proposition 10 and no. 4, Proposition 8) and therefore also with respect to the uniformity of -convergence (§ 1, no. 5, Proposition 5, Corollary 2); is therefore compact, since it is precompact, complete and Hausdorff (§ 1, no. 2, Proposition 1).
Bourbaki puts the proof directly after the statement, so what is above is the statement and its proof together.