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单词 SecondCountable
释义

second countable


A topological spaceMathworldPlanetmath is said to be second if it has a countable basis (http://planetmath.org/BasisTopologicalSpace).It can be shown that a space is both Lindelöf and separable, although the converses fail. For instance, the lower limit topology on the real line is both Lindelöf and separable, but not second countable.

Titlesecond countable
Canonical nameSecondCountable
Date of creation2013-03-22 12:05:06
Last modified on2013-03-22 12:05:06
Ownerrspuzio (6075)
Last modified byrspuzio (6075)
Numerical id17
Authorrspuzio (6075)
Entry typeDefinition
Classificationmsc 54D70
Synonymsecond axiom of countability
Synonymcompletely separable
Synonymperfectly separable
Synonymsecond-countable
Related topicSeparable
Related topicLindelof
Related topicEverySecondCountableSpaceIsSeparable
Related topicLindelofTheorem
Related topicUrysohnMetrizationTheorem
Related topicFirstAxiomOfCountability
Related topicLocallyCompactGroupoids
Related topicFirstCountable
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更新时间:2025/5/4 10:18:23