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