Nuprl Lemma : atom-free-union 0,22

AB:Type. AtomFree(Type;A AtomFree(Type;B AtomFree(Type;A+B
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DefinitionsType, t  T, x:AB(x), AtomFree(T;x), left+right, x.A(x), x:AB(x), P  Q
Lemmasatom-free wf

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