• Interaction With the Empty Set I. We have
    \begin{align*} \webleft [U,\text{Ø}\webright ]_{X} & = U^{\textsf{c}},\\ \webleft [\text{Ø},V\webright ]_{X} & = X, \end{align*}

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


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