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Theorem some

⊦ bag ≠ ∅ ↔ (∃ a. a ∈ bag)

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 1
Proof steps: 4
Used lemmas: in-emp, in,
Used spec theorems:
- bag-basic/extension
Used simplifier rules:
- bag-basic/count-empty