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Proof step 1 from proof perm-put (conclusion)

⊦ n < # y → (perm(x, y[n, a]) ↔ a ∈ x ∧ perm(x -1l a, y -1l y[n]))

System applied rule normalize

And obtained the following new goals

Proof step 2:
n < # y ⊦ perm(x, y[n, a]) ↔ a ∈ x ∧ perm(x -1l a, y -1l y[n])

Rule argument

Additional information