• Distributivity Over Symmetric Differences. We have isomorphisms of sets
    \begin{align*} A\times \webleft (B\mathbin {\triangle }C\webright ) & = \webleft (A\times B\webright )\mathbin {\triangle }\webleft (A\times C\webright ),\\ \webleft (A\mathbin {\triangle }B\webright )\times C & = \webleft (A\times C\webright )\mathbin {\triangle }\webleft (B\times C\webright ), \end{align*}

    natural in $A,B,C\in \text{Obj}\webleft (\mathsf{Sets}\webright )$.


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