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Theorem sub-del-04

⊦ s ⊆ s0 -- a ↔ s ⊆ s0 ∧ ¬ a ∈ s

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 4
Used lemmas: del-rax,
Used spec theorems:
- Used simplifier rules: