• Annihilation With the Empty Set. The diagrams
    commute, i.e. we have equalities of sets
    \begin{align*} \text{Ø}\cap X & = \text{Ø},\\ X\cap \text{Ø}& = \text{Ø}\end{align*}

    for each $U\in \mathcal{P}\webleft (X\webright )$.


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