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Theorem fr

⊦ x ≠ [] → x.first ' + x.rest = x

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by: c-02, c-09, elim-first, firsteq, firsteq-01,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 1
Used lemmas: Nil, Cons, One,
Used spec theorems:
- Used simplifier rules:
  - list-data/fr-02