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Theorem ocs-del-length

⊦ a ≠ b → #oc(a, x -l b) = #oc(a, x)

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by: perm-del-01, sub-del-any,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 2
Proof steps: 12
Used lemmas: oc-n, one-01, one, ocappend, oc-e,
Used spec theorems:
- list-del/del-n
Used simplifier rules: