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Theorem ocs-del1

⊦ 1 < #oc(a, x) → a ∈ x -1l a

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by:
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, ocappend, oc-e, oc-zero,
Used spec theorems:
- Used simplifier rules:
  - list-del/in-05
  - nat-basic1/one
  - list/in-empty
  - list/in-rec
  - nat-basic2/c
  - nat-basic2/a
  - list/in-17
  - nat-basic2/one
  - list/c
  - list-del/del1-y
  - list/in-01
  - list/a
  - list-del/del1-n