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Theorem sub-add

⊦ a ∈ s0 → (s ++ a ⊆ s0 ↔ s ⊆ s0)

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp, localcut,
Comment:
Used by: sub-add-03,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 1
Used lemmas: rax, Subset,
Used spec theorems:
- Used simplifier rules: