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Theorem a

⊦ perm(x, y) → perm(z + x, z + y)

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 1
Used lemmas: sym-02, sym-01, neq, app,
Used spec theorems:
- Used simplifier rules:
  - list/a