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Proof step 4 from proof D-ext (previous step)

∀ ino. (ino ∈ dirs ↔ inodekey(ino) ∈ ri ∧ fs[ri[inodekey(ino)]].directory) ∧ ( ino ∈ dirs → dirs[ino] = mkdir (fs[ri[inodekey(ino)]].size, fs[ri[inodekey(ino)]].meta, fs[ri[inodekey(ino)]].nlink, fs[ri[inodekey(ino)]].nsubdirs, abs-children(ino, fs, ri))) ⊦ ∀ ino. (ino ∈ dirs ↔ ino ∈ abs-dirs(fs, ri)) ∧ (ino ∈ dirs → dirs[ino] = abs-dirs(fs, ri)[ino])

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information

Used simplifier rules: in-dirs: ⊦ ino ∈ abs-dirs(fs, ri) ↔ inodekey(ino) ∈ ri ∧ fs[ri[inodekey(ino)]].directory;