If A is a Lebesgue measurable set then there exists open set G and closed set F with $F\subset A\subset G$ and the measure of G-F is less than epsilon

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Positive measure

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Function sending null sets to null sets.

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The ratio of the volume of a trihedron in a ball to the volume of that ball

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If A is a Lebesgue measurable set then there exists open set G and closed set F with $F\subset A\subset G$ and the measure of G-F is less than epsilon

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