Definition:Injective on Morphisms

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Let $\mathbf C$ and $\mathbf D$ be metacategories.

Let $F: \mathbf C \to \mathbf D$ be a functor.

Then $F$ is said to be injective on morphisms if and only if for all morphisms $f, g$ of $\mathbf C$:

$F f = F g$ implies $f = g$

Note that it is not required that $f$ and $g$ have equal domains or codomains.

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