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Proof step 4 from proof nodups (previous step)

∀ a. a ∈ x ↔ a ∈ y ⊦ x ⊆m y, dups(y), dups(x)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 5:
⊦ x ⊆m y ↔ (∀ a. #oc(a, x) ≤ #oc(a, y))
Proof step 6:
∀ a. a ∈ x ↔ a ∈ y ⊦ ∀ a. #oc(a, x) ≤ #oc(a, y), dups(y), dups(x)

Rule argument

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

Additional information

Used terms: y, x