The

**intersection**of $x$ is the D11: Set \begin{equation} \cap x : = \{ z \mid \forall \, y \in x : z \in y \} \end{equation}

▾ Set of symbols

▾ Alphabet

▾ Deduction system

▾ Theory

▾ Zermelo-Fraenkel set theory

▾ Set

▾ Collection of sets

▾ Alphabet

▾ Deduction system

▾ Theory

▾ Zermelo-Fraenkel set theory

▾ Set

▾ Collection of sets

Results