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

∀ x, a. (perm(x, mklist(a, #oc(a, x)) + y0) ↔ perm(x -l a, y0)) ∨ a ∈ y0 ⊦ a = a0, a0 ∈ x ∧ perm(x -1l a0, mklist(a, #oc(a, x)) + y0) ↔ a0 ∈ x ∧ perm((x -l a) -1l a0, y0), a ∈ y0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 7:
a0 ∈ x, ∀ x, a. (perm(x, mklist(a, #oc(a, x)) + y0) ↔ perm(x -l a, y0)) ∨ a ∈ y0 ⊦ a = a0, perm(x -1l a0, mklist(a, #oc(a, x)) + y0) ↔ perm((x -l a) -1l a0, y0), a ∈ y0

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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