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Theorem bapp

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

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by: bc, nodups-butlastn, postfix-split-stronger,
Used by units in proved state: list-del, path-reachable,
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 2
Used lemmas: bin,
Used spec theorems:
- Used simplifier rules:
  - list/c
  - list/a
  - list/app-01