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Theorem le-one-01

⊦ # x + # y ≤ 1 ∧ x ≠ [] → # x = 1 ∧ y = []

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: 0
Proof steps: 3
Used lemmas: sel-add-dottail, l, size-add, disj-nil-add, gen-list, fr-07, lf-01,
Used spec theorems:
- Used simplifier rules: