Goal:
  
  G1 : t
  G2 : t
  __view_subject_4_ : VSet.Subset (V G1) (V G2)
  __view_subject_5_ : EdgeSet.Subset (E G1) (E G2)
  __view_subject_6_ : s G1 = s G2
  h : VSet.For_all
        (fun x : VSet.elt =>
         VSet.for_all (fun y : VSet.elt => lsp G1 x y == lsp G2 x y) (V G1) =
         true) (V G1)
  ============================
   (subgraph G1 G2)


DEBUG:Going to execute:
trivial; hnf; intros; (solve
            [ do
            ![ solve
             [ trivial | apply : eq_sym ; trivial ]
             | discriminate
             | contradiction
             | Ltac.split ]
            | case not_locked_false_eq_true; Ltac.assumption
            | match goal with
              | H:~ _ |- _ => solve [ case H; trivial ]
              end ])