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Proof step 1 from proof int-add-pos (conclusion)

⊦ 0 ≤ j ∧ j < j1 ∧ j + i = j1 → 0 < i

System applied rule normalize

And obtained the following new goals

Proof step 2:
j + i = j1, j < j1, 0 ≤ j ⊦ 0 < i

Rule argument

Additional information