simp [Operator.const, Operator.operator, Operator.numeral, Operator.Mul.term_eq, complexity_func, Rew.func]
L✝ : Language
L : Language
inst✝³ : L.Zero
inst✝² : L.One
inst✝¹ : L.Add
inst✝ : L.Mul
ξ : Type u_1
n : ℕ
t u : Semiterm L ξ n
⊢ (op(*).operator ![t, u]).complexity = max t.complexity u.complexity + 1
L✝ : Language
L : Language
inst✝³ : L.Zero
inst✝² : L.One
inst✝¹ : L.Add
inst✝ : L.Mul
ξ : Type u_1
n : ℕ
t u : Semiterm L ξ n
⊢ (Finset.univ.sup fun i => (![t, u] i).complexity) = max t.complexity u.complexity