• Associativity. We have an isomorphism of pointed sets
    \[ \webleft (X\vee Y\webright )\vee Z\cong X\vee \webleft (Y\vee Z\webright ), \]

    natural in $\webleft (X,x_{0}\webright ),\webleft (Y,y_{0}\webright ),\webleft (Z,z_{0}\webright )\in \mathsf{Sets}_{*}$.


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