A collection of distinct entities regarded as a unit, being either individually specified or (more usually) satisfying specified conditions.
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Yes the null set is a subset of every set.
It could refer to a member of a set.
In mathematics, if the data in a set shows no relation, then that set shows no trend.
If tiu have a set S, its power set is the set of all subsets of S (including the null set and itself).
In mathematics, an element usually refers to a member of a set.