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Proof step 2 from proof perm-dups (previous step)

dups(y), x ⊆m y, y ⊆m x ⊦ dups(x)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ x ⊆m y ↔ (∀ a. #oc(a, x) ≤ #oc(a, y))
Proof step 4:
dups(y), x ⊆m y, ∀ a. #oc(a, y) ≤ #oc(a, x) ⊦ dups(x)

Rule argument

spec: list-perm inst: name: msubset seq: ⊦ x ⊆m y ↔ (∀ a. #oc(a, x) ≤ #oc(a, y)) subst: [y, x] → [x, y] flags: rewrite, current

Additional information

Used terms: x, y