Nuprl Lemma : causal_order_monotonic3 4,23

T:Type, L:T List, P1P2Q1Q2:(||L||Prop), R1R2:(||L||||L||Prop).
(i:||L||. P1(i P2(i))
 (i:||L||. Q2(i Q1(i))
 (ij:||L||. R1(i,j R2(i,j))
 causal_order(L;R1;P1;Q1)
 causal_order(L;R2;P2;Q2
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DefinitionsP  Q, x:AB(x), t  T, ||as||, False, A, AB, P & Q, i  j < k, {i..j}, Prop, x:AB(x), causal_order(L;R;P;Q)
Lemmasint seg wf, length wf1, le wf

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