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单词 VitaliCovering
释义

Vitali covering


A collectionMathworldPlanetmath of sets 𝒱 in a metric space X is called a Vitali covering (or Vitali class) for X if for each xX and δ>0 there exists U𝒱 such that xU and 0<diam(U)δ.

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更新时间:2025/6/18 20:16:26