• Associativity. We have an isomorphism of sets
    \[ \alpha ^{\mathsf{Sets}}_{A,B,C}\colon \webleft (A\times B\webright )\times C\overset {\scriptstyle \mathord {\sim }}{\dashrightarrow }A\times \webleft (B\times C\webright ), \]

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


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