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Theorem del-03

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

Type: A user defined theorem
Validity: The proof is valid.
Features: localsimp,
Comment:
Used by: del-01, perm-last-rec, perm-mklist-del, rec,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

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