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Theorem in-01

⊦ ¬ a ∈ x → ¬ perm(x, a ' + y)

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 2
Used lemmas: notin, oc-y, msubset, perm,
Used spec theorems:
- Used simplifier rules:
  - list/a
  - nat/le-num-06
  - nat-basic2/a
  - nat-basic2/c