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Theorem sub-one-01

⊦ s ≠ ∅ ++ a → (s ⊆ ∅ ++ a ↔ s = ∅)

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 8
Used lemmas: ne-02, ne-01, In-empty, Extension, in-04, Subset,
Used spec theorems:
- Used simplifier rules: