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→See also: clean up & uniformity
A [[topological space]] ''X'' is said to be a '''2nd-countable space''' if it has a [[countable]] [[basis]] for its topology.
A [[topological space]] ''X'' is said to be a '''2nd-countable space''' if it has a [[countable]] [[basis]] for its topology.
==See Also==
==See also==
*[[1st-countable space]]
*[[1st-countable space]]
[[Category:Topology]]
[[Category:Topology]]