Near a Density Point Every Direction Meets the Set Closely
lemmaAnalysisMultivariable Calculuslem:density-point-nearby-rn-2026aIf is a density point of a set then, for points close enough to , the set comes within a prescribed fraction of the distance from to of the point .
We work in the setting of Euclidean Space and Lebesgue Measure: Standing Notation, whose notation is fixed for every dimension and is used here with a natural number satisfying : the Euclidean norm , distance and closed balls of , the Borel -algebra , and Lebesgue measure are as fixed there. Write for Lebesgue outer measure, and let density point have the meaning fixed in that definition.
Let be an arbitrary subset, let be a density point of , and let with . Then the following holds.
1. (A nearby point of the set) ¶ There is with such that for every with there is with
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