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Theorem fnode-elim-strong

⊦ tree.dir? ↔ ¬(∃ fid. tree = fnode(fid))

Type: A user defined theorem
Validity: The proof is valid.
Features: lss,
Comment:
Used by: dir-del, dir-put, dir-put2, dir-put3, fnode-elim, notdir-notin, setfid-elim, tree-ext,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 2
Used lemmas: isdnode, isfnode,
Used spec theorems:
- Used simplifier rules:
  - directory-tree-base/fnode-inj