Borel regular measure
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In mathematics, an outer measure <math>\mu</math> on <math>\mathbb R^n </math> is called Borel regular if for each <math>A \subset \mathbb R^n </math> there exists a Borel set <math>B</math> such that <math>A \subset B</math> and
- <math>\mu (A) = \mu (B).\,</math>