Require Import WildCat.Core. (** Empty category *)IsGraph Emptyby apply Build_IsGraph. Defined.IsGraph EmptyIs01Cat Emptysrapply Build_Is01Cat; intros []. Defined.Is01Cat EmptyIs0Gpd Emptyconstructor; intros []. Defined.Is0Gpd EmptyIs2Graph EmptyIs2Graph Emptyby apply Build_IsGraph. Defined.f, g: EmptyIsGraph (f $-> g)Is1Cat Emptysnapply Build_Is1Cat; intros []. Defined.Is1Cat Empty