| ∀ i, j, j0. i < j + i1 → i < j0 + i1 ∨ j0 < j, i < j + i1 +1 ⊦ i < j0 + i1 +1, j0 < j |
i < j + i1 + 1, ∀ i, j, j0. i < j + i1 → i < j0 + i1 ∨ j0 < j ⊦ j0 < j, i < j0 + i1 + 1
Used simplifier rules: succ-01: ⊦ i +1 = i + 1;%add-a: ⊦ i + j + i0 = (i + j) + i0;