ThmDex – An index of mathematical definitions, results, and conjectures.
Set of symbols
Alphabet
Deduction system
Theory
Zermelo-Fraenkel set theory
Set
Subset
Definition D80
Power set
Formulation 0
Let $X$ be a D11: Set.
The power set of $X$ is the D11: Set \begin{equation} \mathcal{P}(X) : = \{ E : E \subseteq X \} \end{equation}
Subdefinitions
Set of binary relations
Children
Hyperpower set sequence
Results
Power set is closed under complements
Power set is closed under intersections
Power set is closed under unions
Superadditivity of power set
Conventions
Convention 0 (Notation for power set)
If $X$ is a D11: Set, we denote its D80: Power set either by $\mathcal{P}(X)$ or by $\mathcal{P} X$.