Nuprl Lemma : int_lt_to_int_upper 13,42

i:A:({i+1...}). {j:. (i < j A(j)}  {j:{i+1...}. A(j)} 
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Upint 1, int 1
Definitions{T}, False, A, A  B, t  T, P  Q, P & Q, x(s), P  Q, P  Q, , {i...}, x:AB(x)
Lemmasle wf, int upper wf

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