Canonical Structure FT_c3 (i : FT_I) := Build_Com_arrow (FT_eq3 i).

(* Specifications: *)
Lemma FT_eq4 : FT_Apeps FT_j0 o FT_t' =_S Id Lim_EoQ.
Lemma FT_h_diese_unique : FT_h' =_S FT_h_diese.