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Theorem del-01

⊦ 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: adjoin, perm-l, perm-one, perm-rmdup-rev, rec, rec-01, shift-03,
Used by units in proved state: olist,
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 1
Proof steps: 2
Used lemmas: del, sym-02, del-03, sym,
Used spec theorems:
- Used simplifier rules:
  - list/a