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Theorem In-insert
⊦ a ∈ s ++ b ↔ a = b ∨ a ∈ s
Type: An axiom
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by:
add
,
in-02
,
Used by units in proved state:
set-union
,
Proof exists?: No