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Proof step 3 from proof cons (previous step)

⊦ unique_al((a × d) + ax) ↔ ¬ a ∈ ax ∧ unique_al(ax)

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: assoclist inst: name: unique-r seq: ⊦ unique_al((a × d) + ax) ↔ ¬ a ∈ ax ∧ unique_al(ax) subst: [ax, d, a] → [ax, d, a] flags: rewrite, current

Additional information

Used terms: ax, d, a