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Proof step 1 from proof le-add-01 (conclusion)

⊦ n < m ∧ n0 < m0 → (m + m0 ≤ n + n0 ↔ false)

System applied rule normalize

And obtained the following new goals

Proof step 2:
n < m, n0 < m0 ⊦ m + m0 ≤ n + n0 ↔ false

Rule argument

Additional information