Nuprl Lemma : nat_ind_a 13,42

P:({k}). P(0)  (i:P(i - 1)  P(i))  {i:P(i)} 
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Upint 1, int 1
DefinitionsFalse, A, A  B, t  T, {T}, x(s), P  Q, , , x:AB(x), i  j , , S  T
Lemmasnat plus inc, le wf, nat plus wf, nat wf, ge wf, nat properties

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