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Theorem sperm

⊦ sort(x) = sort(y) ↔ perm(x, y)

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 4
Proof steps: 7
Used lemmas: Ordered, perm, Perm,
Used spec theorems:
- olist/eqdef
Used simplifier rules: