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Theorem oc-del-01

⊦ a ∈ y → #oc(a, (x + y) -1l a) = #oc(a, x + y) -1

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 2
Proof steps: 4
Used lemmas: del1, in-05, oc-zero, ocappend,
Used spec theorems:
- Used simplifier rules: