Whitney Covering Lemma
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High Quality Content by WIKIPEDIA articles! In mathematical analysis, the Whitney covering lemma is a lemma which asserts the existence of a certain type of partition of an open set in a Euclidean space. Originally it was employed in the proof of Hassler Whitney's extension theorem. The lemma was subsequently applied to prove generalizations of the Calderón-Zygmund decomposition. Roughly speaking, the lemma states that it is possible to cover an open set by cubes each of whose diameter is proportional, within certain bounds, to its distance from the boundary of the open set.

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High Quality Content by WIKIPEDIA articles! In mathematical analysis, the Whitney covering lemma is a lemma which asserts the existence of a certain type of partition of an open set in a Euclidean space. Originally it was employed in the proof of Hassler Whitney's extension theorem. The lemma was subsequently applied to prove generalizations of the Calderón-Zygmund decomposition. Roughly speaking, the lemma states that it is possible to cover an open set by cubes each of whose diameter is proportional, within certain bounds, to its distance from the boundary of the open set.