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Theorem oc-dups

⊦ n < #oc(a, x) ∧ ¬ dups(x) → #oc(a, x) = 1

Type: A user defined theorem
Validity: The proof is valid.
Features: forward, localforward,
Comment:
Used by: nodups, size-perm,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 1
Proof steps: 6
Used lemmas: one-01, notin, one, ocappend, oc-e, oc-zero,
Used spec theorems:
- Used simplifier rules: