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Theorem adjoin-notin
⊦ ¬ a ∈ x → x ++ a = a + x
Type: An axiom
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by:
dups-01
,
empty-01
,
in-08
,
Used by units in proved state:
list-perm
,
Proof exists?: No