| ¬ a0 < a, ∀ x1, x2. # x1 + # x2 < #(a + []) + #(a0 + []) → true → x1 + x2 = [] ∨ max(x1 + x2) = max(x2 + x1) ⊦ a0 = (a < a0 ⊃ a0;a) |
∀ x1, x2. # x1 + # x2 < #(a + []) + #(a0 + []) → true → x1 + x2 = [] ∨ max(x1 + x2) = max(x2 + x1) ⊦ a0 = (a < a0 ⊃ a0;a), a0 < a