∀ i. i + j0 < j0 ↔ i < 0 ⊦ i + j0 < j0 ↔ i < 0
Used simplifier rules: add-pred: ⊦ i + j -1 = (i + j)-1;%add-a: ⊦ i + j + i0 = (i + j) + i0;% ⊦ i -1 < j -1 ↔ i < j; (s)