Goal:
    G : t  HI : invariants
  ============================
   (ssrbool.reflect
      (VSet.For_all (fun x : VSet.elt => lsp x x = Some 0) (V G)) is_acyclic)


DEBUG:Going to execute:
apply VSet_Forall_reflect
DEBUG LTAC Evaluated term: reflect_reflectProp
DEBUG LTAC Evaluated term: reflect_logically_equiv
DEBUG LTAC Evaluated term: acyclic_caract2