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Theorem leftmost-left

⊦ t ≠ leaf → t .leftmost ∈ t .left ∨ t .leftmost = t .val

Type: A user defined theorem
Validity: The proof is valid.
Features:
Comment:
Used by: ismin,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 6
Used lemmas: in-branch, leftmost,
Used spec theorems:
- Used simplifier rules:
  - tree/disj
  - tree/elim