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Theorem diff-twice-append

⊦ (x \ y) \ z = x \ (y + z)

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 17
Used lemmas: diff-n, diff-y, diff-e,
Used spec theorems:
- Used simplifier rules:
  - list/in-11
  - list/in-12
  - list/in-append
  - list/app-08
  - list/a
  - list/c