Nuprl Lemma : int_seg_well_founded_up 13,42

i:j:{i...}. WellFnd{u}({i..j};x,y.x < y
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Upint 2, int 2
Definitionst  T, x:AB(x), x,yt(x;y), , {i...}, P & Q, i  j < k, x(s1,s2), P  Q, {i..j}
Lemmasint upper wf, int upper well founded, le wf, int seg wf, inv image ind

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