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Theorem perm-l

⊦ perm(a ' + x, y) ↔ a ∈ y ∧ perm(x, y -1l a)

Type: A user defined theorem
Validity: The proof is valid.
Features: localsimp,
Comment:
Used by: app-04, perm-mklist, perm-rec, rec-01, shift-03,
Used by units in proved state: olist-sort,
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 1
Used lemmas: del-01,
Used spec theorems:
- Used simplifier rules:
  - list/a