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Proof step 1 from proof ls-add-not-02 (conclusion)

⊦ m ≤ m0 ∧ n ≤ n0 ∧ m1 ≤ n1 → ¬ m0 + n0 + n1 + n2 < m + n + m1

System applied rule normalize

And obtained the following new goals

Proof step 2:
m0 + n0 + n1 + n2 < m + n + m1, m ≤ m0, n ≤ n0, m1 ≤ n1 ⊦

Rule argument

Additional information