• Interaction With Unions. We have
    \[ \webleft (U\mathbin {\triangle }V\webright )\cup \webleft (V\mathbin {\triangle }T\webright ) = \webleft (U\cup V\cup W\webright )\setminus \webleft (U\cap V\cap W\webright ) \]

    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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