Set: pp::colors
  Set: pp::unicode
  Assumed: a
  Assumed: b
  Assumed: f
  Assumed: g
λ x x2 : ℕ, (∀ y : ℕ, g y = x) → x > x2 + x
funext (λ x : ℕ,
          funext (λ x2 : ℕ,
                    imp_congr
                        (refl (∀ y : ℕ, g y = x))
                        (λ C::3 : ∀ y : ℕ, g y = x,
                           congr (congr2 Nat::gt (C::3 (a + x + b))) (congr2 (Nat::add x2) (C::3 x)))))