• Lax Preservation of Colimits. We have an inclusion of sets
    \[ \bigcup _{i\in I}R_{-1}\webleft (U_{i}\webright )\subset R_{-1}\webleft (\bigcup _{i\in I}U_{i}\webright ), \]

    natural in $\webleft\{ U_{i}\webright\} _{i\in I}\in \mathcal{P}\webleft (B\webright )^{\times I}$. In particular, we have inclusions

    \[ \begin{gathered} R_{-1}\webleft (U\webright )\cup R_{-1}\webleft (V\webright ) \subset R_{-1}\webleft (U\cup V\webright ),\\ \text{Ø}\subset R_{-1}\webleft (\text{Ø}\webright ), \end{gathered} \]

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


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