• End Formula for the Set of Inclusions of Relations. We have
    \[ \textup{Hom}_{\mathbf{Rel}\webleft (A,B\webright )}\webleft (R,S\webright )\cong \int _{a\in A}\int _{b\in B}\textup{Hom}_{\{ \mathsf{t},\mathsf{f}\} }\webleft (R^{b}_{a},S^{b}_{a}\webright ). \]

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