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Theorem sym

⊦ disj(x, y) → disj(y, x)

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, forward, localforward,
Comment:
Used by: aa, app-03, cons-03, cons-04, firstoc, lastoc,
Used by units in proved state: list-last,
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 3
Proof steps: 9
Used lemmas: cons-02, first-01, disjoint, cons-01, e, dis-empty,
Used spec theorems:
- Used simplifier rules:
  - list/c
  - list/a
  - list/in-rec