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Theorem in-append0-not-left

⊦ a ' + x = x0 + x1 → (a ∈ x0 ↔ x0 ≠ [])

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 3
Used lemmas: a, in-06, c, e-01, c-06, in-empty,
Used spec theorems:
- Used simplifier rules: