Nuprl Lemma : fpf-sub-join 11,40

A:Type, B:(AType), eq:EqDecider(A), fg:a:A fp B(a). f || g  {f  f  g & g  f  g
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Definitionsx:AB(x), x(s), P  Q, {T}, P & Q, t  T, xt(x),
Lemmasfpf-sub-join-left, fpf-sub-join-right, fpf-compatible wf, fpf wf, deq wf

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