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Theorem ocs-del1-if

⊦ #oc(a, x -1l b) = (a ≠ b ∨ ¬ b ∈ x ⊃ #oc(a, x);#oc(a, x) -1)

Type: A user defined theorem
Validity: The proof is valid.
Features:
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: del1, del1-01,
Used spec theorems:
- Used simplifier rules:
  - nat/pred-03
  - list-del/in-02-01