Example 4.2.12. A homomorphism $p : G\to H$ of groups gives rise to a functor between the associated groupoids in Example 4.2.6. It is faithful (resp. fully faithful) if and only if $p$ is injective (resp. an isomorphism).
Example 4.2.12. A homomorphism $p : G\to H$ of groups gives rise to a functor between the associated groupoids in Example 4.2.6. It is faithful (resp. fully faithful) if and only if $p$ is injective (resp. an isomorphism).
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