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

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


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