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Theorem subdef

⊦ s1 ⊆ s2 ↔ (∀ a. a ∈ s1 → a ∈ s2)

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: 5
Used lemmas:
Used spec theorems:
- set-union/subdef
Used simplifier rules: