Here, page 6, Daniel Murfet said, the category of functors $(\mathcal{A}, \mathcal{B})$ can be empty, although it is nonempty if $\mathcal{B}$ has zero object. Why?
[Zero object: An object which is both initial and terminal. ]
2026-03-25 05:06:55.1774415215
The category of functors if the codomain category has zero object is non-empty. Why?
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