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Theorem union-del

⊦ a ∈ (s -- a) ∪ s0 ↔ a ∈ s0

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by:
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: unrax, undel, del-rax, unc, una, undel-03,
Used spec theorems:
- Used simplifier rules: