Subsubsection 6.2.5.6 (00KR): The Left Unitors

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For each horizontal morphism $R\colon A\mathrel {\rightarrow \kern -9.5pt\mathrlap {|}\kern 6pt}B$ of $\mathsf{Rel}^{\mathsf{dbl}}$, the component

of the left unitor of $\mathsf{Rel}^{\mathsf{dbl}}$ at $R$ is the identity inclusion¹

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