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Proof step 3 from proof rev-rev (previous step)

⊦ # rev(rev(ar)) = # ar ∧ (∀ n. n < # rev(rev(ar)) → rev(rev(ar))[n] = ar[n])

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 4:
n < # ar ⊦ rev(rev(ar))[n] = ar[n], # ar = 0

Rule argument

Additional information

Used simplifier rules: rev-size: ⊦ # rev(ar) = # ar;%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic1