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strictly positive measure : ウィキペディア英語版
strictly positive measure

In mathematics, strict positivity is a concept in measure theory. Intuitively, a strictly positive measure is one that is "nowhere zero", or that it is zero "only on points".
==Definition==
Let (''X'', ''T'') be a Hausdorff topological space and let Σ be a σ-algebra on ''X'' that contains the topology ''T'' (so that every open set is a measurable set, and Σ is at least as fine as the Borel σ-algebra on ''X''). Then a measure ''μ'' on (''X'', Σ) is called strictly positive if every non-empty open subset of ''X'' has strictly positive measure.
In more condensed notation, ''μ'' is strictly positive if and only if
:\forall U \in T \mbox U \neq \emptyset, \mu (U) > 0.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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