"The set of all the subsets of a set"
Example: If we have a set {a,b,c}:
* Then a subset of it could be {a} or {b}, or {a,c}, and so on,
* And {a,b,c} is also a subset of {a,b,c}
* And the empty set {} is also a subset of {a,b,c}
So all the subsets together make the Power Set:
P(S) = { {}, {a}, {b}, {c}, {a, b}, {a, c}, {b, c}, {a, b, c} }
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