• Interaction With Symmetric Differences. We have an equality of sets
    \[ U\setminus V=U\mathbin {\triangle }\webleft (U\cap V\webright ) \]

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


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