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Theorem del-e-02

⊦ s -- a = ∅ ↔ s = ∅ ∨ s = ∅ ++ a

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by: del-e-01,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 12
Used lemmas: del-rax, ext,
Used spec theorems:
- Used simplifier rules: