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Proof step 2 from proof unique (previous step)

unique_al(ax + p ') ⊦ unique_al(ax)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
unique_al(ax + p ') ⊦ ax = [], ¬ ax.head.1 ∈ ax.tail ∧ unique_al(ax.tail)

Rule argument

Additional information

Used simplifier rules: k-unique-r: ⊦ unique_al(ay) ↔ ay = [] ∨ ¬ ay.head.1 ∈ ay.tail ∧ unique_al(ay.tail);