Definition encoding_algorithm :
  forall (x y : Z) (h1 : (0 < x)%Z) (h2 : (0 < y)%Z) (H : fractionalAcc x y),
  Qpositive.

Theorem Zminus2_wf : forall x y : Z, (0%nat < x)%Z -> (0 < y)%Z -> fractionalAcc x y.