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Proof step 1 from proof lastN-empty (conclusion)

⊦ lastn(n, x) = [] ↔ n = 0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
lastn(n, x) = [] ⊦ n = 0

Rule argument

Additional information

Used simplifier rules: lastN-zero: ⊦ lastn(0, x) = [];