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Proof step 1 from proof perm-swap (conclusion)

m < # A, m0 < # A ⊦ perm(A[m0, A[m]][m, A[m0]], A0) ↔ perm(A, A0)

System applied rule normalize

And obtained the following new goals

Proof step 2:
m0 < # A, m < # A ⊦ perm(A[m0, A[m]][m, A[m0]], A0) ↔ perm(A, A0)

Rule argument

Additional information