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Theorem subset-in

⊦ bag0 ++ a ⊆ bag1 → (count(a, bag1) = 0 ↔ false)

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 1
Proof steps: 3
Used lemmas: count-subset,
Used spec theorems:
- Used simplifier rules: