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Theorem unadd

⊦ (s ++ a) ∪ s0 = (s ∪ s0) ++ a

Type: A user defined theorem
Validity: The proof is valid.
Features: s, ls,
Comment:
Used by: k-union-rec1, k-union-rec2, union-one, union-rewone,
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: una, unrax,
Used spec theorems:
- Used simplifier rules:
  - infset-basic/In-insert
  - infset-union/ext