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Theorem ext-setequal

⊦ x ≡ y ↔ (∀ a. a ∈ x ↔ a ∈ y)

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: 6
Proof steps: 15
Used lemmas: setequal-def,
Used spec theorems:
- list-set/subset
Used simplifier rules: