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Theorem del-04

⊦ perm(x, y) → perm(x -1l a, y -1l a)

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 6
Proof steps: 19
Used lemmas: in, in-05, oc-zero, notin, del1, del1-01, perm-all, ref, trans, sym-02, sym-01,
Used spec theorems:
- Used simplifier rules: