Goal:
  
  G : t
  x : V.t
  y : V.t
  s : VSet.t
  s' : VSet.t
  p : SPath G s x y
  q : SPath G s' y x
  acG : acyclic_no_loop G
  ============================
   (weight (to_pathOf G p) <= - weight (to_pathOf G q) ->
    sweight p <= - sweight q)


DEBUG:Going to execute:
<coq-core.plugins.ssreflect::ssrtclby@0> $1
DEBUG LTAC Evaluated term: (weight_inverse G x y (to_pathOf G p)
                              (to_pathOf G q) acG)