Measure Zero

Let μ be a measure on a sigma algebra Σ of subsets of a set X. An element A in Σ is said to have measure zero if μ(A)=0. Any set of measure zero is a null set. The opposite is not true, because a null set is not required to be measurable, that is, to be an element in Σ. However, any null set is a subset of a set of measure zero.

Examples

Consider the Lebesgue measure μ over the real numbers.
  • An uncountable set of real numbers which has measure zero is the Cantor set.

See also

 

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