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Proof step 6 from proof crash-exists (previous step)

⊦ posix-crash(tree0, fs0, ofh0, tree1, fs1, ofh1) ↔ ofh1 = ∅ ∧ tree1 = tree0 ∧ (∀ fid. fid ∈ fs1 ↔ fid ∈ tree1.fids ∧ fid ∈ fs0) ∧ (∀ fid. fid ∈ fs1 → fs1[fid] = fs0[fid])

Lemma posix-crash