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Proof step 6 from proof perm-mklist (previous step)

perm(x -1l a, mklist(a, n0)), perm(mklist(a, n0), x -1l a), a ∈ x, ∀ x0, a0. perm(x0, mklist(a0, n0)) → x0 = mklist(a0, n0) ⊦ x = a ' + mklist(a, n0)

User applied rule all left

And obtained the following new goals

Proof step 7:
perm(x -1l a, mklist(a, n0)), perm(mklist(a, n0), x -1l a), a ∈ x, perm(x -1l a, mklist(a, n0)) → x -1l a = mklist(a, n0) ⊦ x = a ' + mklist(a, n0)

Rule argument

pos: left 4 terms: x -1l a, a abort: F discard: T computed: T

Additional information

Used terms: x -1l a, a