• Associativity. We have[1]
    \[ \webleft (U\mathbin {\triangle }V\webright )\mathbin {\triangle }W = U\mathbin {\triangle }\webleft (V\mathbin {\triangle }W\webright ) \]

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


Footnotes

[1] Illustration:

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