• Interaction With Unions II. The diagram
    commute, i.e. we have
    \begin{align*} U\cup \webleft(\bigcap _{V\in \mathcal{V}}V\webright) & = \bigcap _{V\in \mathcal{V}}\webleft (U\cup V\webright ),\\ \webleft(\bigcap _{U\in \mathcal{U}}U\webright)\cup V & = \bigcap _{U\in \mathcal{U}}\webleft (U\cup V\webright )\end{align*}

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


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