- For all objects c of C, G(c) ⊆ F(c), and
- For all arrows f:c′→c of C, G(f) is the restriction of F(f) to G(c′).
This relation is often written as G ⊆ F.
For example, let 1 be the category with a single object and a single arrow. A functor F:1→Set maps the unique object of 1 to some set S and the unique identity arrow of 1 to the identity function 1S on S. A subfunctor G of F maps the unique object of 1 to a subset T of S and maps the unique identity arrow to the identity function 1T on T. Notice that 1T is the restriction of 1S to T. Consequently, subfunctors of F correspond to subsets of S.
Read more about this topic: Subfunctor
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