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Theorem l

⊦ perm(x, y) → (# x = # y ↔ true)

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 2
Proof steps: 4
Used lemmas: subsize, msubset, perm,
Used spec theorems:
- Used simplifier rules: