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Theorem dir-del
p ≠ ε ⊦ p ∈ tree → ((tree -- p).dir? ↔ tree.dir?)
Type: A user defined theorem
Validity: The proof is valid.
Features: s, ls,
Comment:
Used by:
Used by units in proved state:
posix-asm
,
Proof exists?: Yes
View
the proof
Infos about the proof
Proved?: Yes
Interactions: 0
Proof steps: 2
Used lemmas:
dnode-del
,
fnode-elim-strong
,
dnode-elim-strong
,
notdir-notin
,
Used spec theorems:
Used simplifier rules: