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Proof step 1 from proof perm-shift-one (conclusion)

m + 1 < # A ⊦ perm(A[m + 1, a], A0) → perm(A[m, a][m + 1, A[m]], A0)

System applied rule normalize

And obtained the following new goals

Proof step 2:
m + 1 < # A, perm(A[m + 1, a], A0) ⊦ perm(A[m, a][m + 1, A[m]], A0)

Rule argument

Additional information