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Theorem bin-02

⊦ ¬ a ∈ x.butlast ∧ a ∈ x → a = x.last

Type: A user defined theorem
Validity: The proof is valid.
Features: forward, localforward,
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: last-elim,
Used spec theorems:
- Used simplifier rules:
  - list/e-02
  - list/a
  - list/in-append
  - list/in-17
  - list/in-empty