Item 4 (003N) — The Clowder Project

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*To be replaced with Linus Romer's Elemaints when it is released.

Unitality. We have equalities of sets
\begin{align*} U\cup \emptyset & = U,\\ \emptyset \cup U & = U \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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