Definition 13.14.9. In Situation 13.14.1. We say $F$ is *right derivable*, or that $RF$ *everywhere defined* if $RF$ is defined at every object of $\mathcal{D}$. We say $F$ is *left derivable*, or that $LF$ *everywhere defined* if $LF$ is defined at every object of $\mathcal{D}$.

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