In mathematics, a **null set** is a set that is negligible *in some sense*. For different applications, the meaning of "negligible" varies. In measure theory, any set of measure 0 is called a null set (or simply a **measure-zero set**). More generally, whenever an ideal is taken as understood, then a null set is any element of that ideal.

The remainder of this article discusses the measure-theoretic notion.

Read more about Null Set: Definition, Properties, Lebesgue Measure, Uses

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