In mathematical sets, the null set, also called the empty set, is the set that does not contain anything. It is symbolized or { }. There is only one null set. This is because there is logically only one way that a set can contain nothing.
What is null set? - Definition from WhatIs.com
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Null set - Wikipedia
https://en.wikipedia.org/wiki/Null_set
In set theory, a null set N ⊂ R {\displaystyle N\subset \mathbb {R} } {\displaystyle N\subset \mathbb {R} } is a set that can be covered by a countable union of intervals of arbitrarily small total length. The notion of null set in set theory anticipates the development of Lebesgue measure since a null set necessarily has measure ...
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