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power set
In mathematics, the power set (or powerset) of any set , written (), ℘(), , or , is the set of all subsets of , including the empty set and itself. In axiomatic set theory (as developed, for example, in the ZFC axioms), the existence of the power set of any set is postulated by the axiom of power set.
Any subset of () is called a ''family of sets'' over .
==Example==
If is the set }, then the subsets of are:
*
* }
* }
* }
* }
* }
* }
and hence the power set of is .
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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