Set: pp::colors
  Set: pp::unicode
  Assumed: f
∀ a : ℤ, (f a a) > 0
∀ a b : ℤ, (f a b) > 0
  Assumed: g
∀ (a : ℤ) (b : ℝ), (g a b) > 0
∀ a b : ℤ, (g a (f a b)) > 0
  Set: lean::pp::coercion
∀ a b : ℤ, (g a (int_to_real (f a b))) > (nat_to_int 0)
λ a : ℕ, a + 1
λ a b : ℕ, a + b
λ a b c : ℤ, a + c + b
(λ a b : ℕ, a + b) 10 20
  Assumed: x
λ a b : ℤ, a + x + b