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Proof step 1 from proof inv-mkdir (conclusion)

root.dir?, fids-cons(root, fs, ofh) ⊦ ⟪posix_mkdir#(path, md, user, fs, ofh; err, root; psynced)⟫ (root.dir? ∧ fids-cons(root, fs, ofh))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information