fact: Definition from_initial `{@IsInitialCategory zero} (F G : Functor zero C) : NaturalTransformation F G := Build_NaturalTransformation F G (fun x => initial_category_ind _ x) (fun x _ _ => initial_category_ind _ x).
imports: Category.Core Functor.Core NaturalTransformation.Core NaturalTransformation.Paths InitialTerminalCategory.Core InitialTerminalCategory.Functors Contractible