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Regular measure : ウィキペディア英語版
Regular measure
In mathematics, a regular measure on a topological space is a measure for which every measurable set can be approximated from above by open measurable sets and from below by compact measurable sets.
==Definition==

Let (''X'', ''T'') be a topological space and let Σ be a σ-algebra on ''X''. Let ''μ'' be a measure on (''X'', Σ). A measurable subset ''A'' of ''X'' is said to be inner regular if
:\mu (A) = \sup \
and said to be outer regular if
:\mu (A) = \inf \
*A measure is called inner regular if every measurable set is inner regular. Some authors use a different definition: a measure is called inner regular if every open measurable set is inner regular.
*A measure is called outer regular if every measurable set is outer regular.
*A measure is called regular if it is outer regular and inner regular.

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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