Nuprl Lemma : pairwise-singleton 0,22

Pv:Top. (x,y[v].P(x,y))  True 
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DefinitionsTop, (x,yL.P(x;y)), P  Q, P & Q, P  Q, P  Q, x(s1,s2), {i..j}, x:AB(x), t  T, True
Lemmastrue wf, int seg wf, top wf

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