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Proof step 3 from proof crash-neutral-unmap (previous step)

m < # avol, ebm-vol-inv(avol), avol ⊆ avol0 ⊦ ⟨if m < # avol then avol[m] := unmapped else abort⟩ (avol ⊆ avol0)

Heuristic symbolic execution applied rule if positive right

And obtained the following new goals

Proof step 4:
m < # avol, ebm-vol-inv(avol), avol ⊆ avol0 ⊦ ⟨avol[m] := unmapped⟩ (avol ⊆ avol0)

Rule argument

pos: right 1

Additional information

Used simplifier rules: ⊦ m < n ↔ ¬ n ≤ m; (ss)% ⊦ m < n → (n ≤ m ↔ false); (s)