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Theorem exin

⊦ a ∈ bag → (∃ bag0. bag = bag0 ++ a)

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 3
Proof steps: 5
Used lemmas: count-del, in,
Used spec theorems:
- bag-basic/extension
- bag-basic/count-other
Used simplifier rules: