Nuprl Lemma : causal_order_or 4,23

T:Type, L:T List, R:(||L||||L||Prop), P1P2P3:(||L||Prop).
(Trans _1,_2:||L||. R(_1,_2))
 causal_order(L;R;P1;P2)
 causal_order(L;R;P1;P3)
 causal_order(L;R;P1;i.P2(i P3(i)) 
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Definitionst  T, {i..j}, x:AB(x), AB, Prop, P & Q, x:AB(x), P  Q, P  Q, ||as||, x,yt(x;y), Trans x,y:TE(x;y), False, A, i  j < k, causal_order(L;R;P;Q)
Lemmastrans wf, int seg wf, length wf1, le wf

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