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Theorem a

⊦ ¬ dups(x + y) → ¬ dups(x) ∧ ¬ dups(y)

Type: A user defined theorem
Validity: The proof is valid.
Features: forward,
Comment:
Used by:
Used by units in proved state: list-del, path-reachable, list-set, list-dup, list-dup,
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 1
Used lemmas: app-01-02, app-05,
Used spec theorems:
- Used simplifier rules:
  - list/a