Ivan Shishkin, Birch Grove

Second-countable space

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Revision 647

7/27/2026, 9:39:02 AM · Ancient Tree

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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

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