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Theorem perm-del

⊦ perm(x, y) → (perm(x -1l a, z) ↔ perm(y -1l a, z))

Type: A user defined theorem
Validity: The proof is valid.
Features:
Comment:
Used by: perm-put,
Used by units in proved state: olist,
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 2
Proof steps: 6
Used lemmas: del-04, sym-02, neq, ref, trans, sym-01,
Used spec theorems:
- Used simplifier rules: