• Distributivity Over Intersections. We have
    \begin{align*} U\cap \webleft (V\mathbin {\triangle }W\webright ) & = \webleft (U\cap V\webright )\mathbin {\triangle }\webleft (U\cap W\webright ),\\ \webleft (U\mathbin {\triangle }V\webright )\cap W & = \webleft (U\cap W\webright )\mathbin {\triangle }\webleft (V\cap W\webright ) \end{align*}

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


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