Item 3 (003M) — The Clowder Project

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

Associativity. We have an equality of sets
\[ \webleft (U\cup V\webright )\cup W = U\cup \webleft (V\cup W\webright ) \]

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

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