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Theorem subdel-02

⊦ x -1l a ⊆m y ↔ x -l a ⊆m y -l a ∧ #oc(a, x) ≤ #oc(a, y) + 1

Type: A user defined theorem
Validity: The proof is valid.
Features:
Comment:
Used by:
Used by units in proved state:
Proof exists?: Yes

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Infos about the proof

Proved?: Yes
Interactions: 2
Proof steps: 3
Used lemmas: in-05, notin, del1, sub-del-any,
Used spec theorems:
- Used simplifier rules: