• Interaction With Complements II. We have
    \begin{align*} U\mathbin {\triangle }X & = U^{\textsf{c}},\\ X\mathbin {\triangle }U & = U^{\textsf{c}}\end{align*}

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


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