Ivan Shishkin, Birch Grove

Second-countable space

Concept history

A revision trail for this concept page.

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Revision 7180

10/14/2026, 11:38:36 AM · Ancient Tree

Added exercise "Sous-espace d'un espace à base dénombrable."

linked exercisesEspace sans base dénombrableEspace sans base dénombrable, Sous-espace d’un espace à base dénombrable.

Revision 7173

10/14/2026, 11:23:56 AM · Ancient Tree

Added exercise "Espace sans base dénombrable"

linked exercisesNoneEspace sans base dénombrable

Revision 874

8/3/2026, 7:15:03 PM · Ancient Tree

Concept marked usable

This older revision predates detailed metadata tracking.

Revision 647

7/27/2026, 9:39:02 AM · Ancient Tree

Concept edited

Recorded titleSecond-countable space
Recorded typeDefinition
Compare with revision 6462 changed lines
1A second-countable space is a [[Topological space|topological space]] whose topology has a [[countable|countable]] [[Base|base]].
1A second-countable space is a [[Topological space|topological space]] whose topology has a [[Countable set|countable]] [[Base of a topology|base]].

Revision 646

7/27/2026, 9:38:43 AM · Ancient Tree

Concept created

A second-countable space is a [[Topological space|topological space]] whose topology has a [[countable|countable]] [[Base|base]].