• Interaction With Unions I. We have equalities of sets
    \[ U\setminus \webleft (V\cup W\webright )=\webleft (U\setminus V\webright )\cap \webleft (U\setminus W\webright ) \]

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


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