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Theorem notdir-notin

⊦ ¬ tree.dir? → (p ∈ tree ↔ p = ε)

Type: A user defined theorem
Validity: The proof is valid.
Features: s, ls,
Comment:
Used by: dir-del,
Used by units in proved state: posix-asm, posix-base,
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 2
Used lemmas: fnode-notin, fnode-elim-strong, nil-in,
Used spec theorems:
- Used simplifier rules: