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Proof step 2 from proof range-last-2 (previous step)

n + 1 < # zbrar ⊦ key-range(zbrar, n + 1, n + 2, ri) = ri |> zbrar[n].key

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
n + 1 < # zbrar ⊦ key-range(zbrar, n + 1, n + 2, ri) = ri |> zbrar[n].key

Rule argument

Additional information

Used simplifier rules: ⊦ m < n → n ≠ 0; (s)%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic