• Triple Differences. We have
    \[ U\setminus \webleft (V\setminus W\webright )=\webleft (U\cap W\webright )\cup \webleft (U\setminus V\webright ) \]

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


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