∀ (R : Type u_1) {X : Type u_2} [inst : CommSemiring R] {A : Type u_3} [inst_1 : Semiring A] [inst_2 : Algebra R A]
  (f : X → A) (a b : FreeAlgebra.Pre R X),
  FreeAlgebra.Rel R X a b → FreeAlgebra.liftFun R X f a = FreeAlgebra.liftFun R X f b