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Proof step 3 from proof inv-unmap (previous step)

m < # avol, ebm-vol-inv(avol) ⊦ ⟪ebm_avol_unmap#(m; avol)⟫ ebm-vol-inv(avol)

Heuristic unfold applied rule call right

And obtained the following new goals

Proof step 4:
m < # avol, ebm-vol-inv(avol) ⊦ ⟪if m < # avol then avol[m] := unmapped else abort⟫ ebm-vol-inv(avol)

Rule argument

pos: right 1

Additional information

Used simplifier rules: unmap: ⊦ ;