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Theorem prefix-butlast

⊦ x0 ≠ [] ∧ x0 ⊑ x1 → x0.butlast ⊑ x1

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: 1
Proof steps: 2
Used lemmas: prefix-app-04, last-elim,
Used spec theorems:
- Used simplifier rules:
  - list/e-02
  - list/a