• Interaction With Complements III. We have
    \[ U^{\textsf{c}}\mathbin {\triangle }V^{\textsf{c}}=U\mathbin {\triangle }V \]

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


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