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Theorem union

⊦ count(a, bag0 ∪ bag1) = count(a, bag0) + count(a, bag1)

Type: A user defined theorem
Validity: The proof is valid.
Features: localsimp,
Comment:
Used by: in-union, union-ass, union-com, union-diff-cancel, union-diff-distr, union-inj, union-subset, union-subset-inj,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 2
Proof steps: 7
Used lemmas: union-rec, union-empty,
Used spec theorems:
- bag-basic/count-other
Used simplifier rules: