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Theorem eq-one

⊦ # 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: 2
Used lemmas: disj-1, l, size-02, elim-list-c, fr-07, lf-01,
Used spec theorems:
- Used simplifier rules: