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Proof step 1 from proof sorted-insert-merge (conclusion)

0 < m ⊦ sorted(A, 0, m) ∧ sorted(A, m + 1, n) ∧ A[m - 1] ≤ a ∧ a ≤ A[m + 1] → sorted(A[m, a], 0, n)

System applied rule normalize

And obtained the following new goals

Proof step 2:
0 < m, sorted(A, 0, m), sorted(A, m + 1, n), A[m - 1] ≤ a, a ≤ A[m + 1] ⊦ sorted(A[m, a], 0, n)

Rule argument

Additional information