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Theorem blapp-01

⊦ x ≠ [] → (x.butlast = y ↔ x = y + x.last ')

Type: A user defined theorem
Validity: The proof is valid.
Features: localsimp,
Comment:
Used by: b-01, postfix-split-stronger, splitlasteq, splitlasteq-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: blapp, butlast-last,
Used spec theorems:
- Used simplifier rules:
  - list/a