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Theorem del1

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

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by: ad, del, del-02, del-04, del-05, delapp, oc-del, oc-del-01, oc-del-02, ocs-del1-if, perm-put-del1, subdel-01, subdel-02, subdel-03, subrec,
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: oc-n, one-01, one, ocappend, oc-e, in-05,
Used spec theorems:
- Used simplifier rules: