Nuprl Lemma : nat-inherence 0,22

a:Atom1, n:n:>>a 
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Definitionst  T, x:AB(x), , Type, #$n, a<b, Void, False, x:AB(x), P  Q, A, AB, , {x:AB(x) }, AtomFree(T;x), x:AB(x), x:AB(x), x:T>>a, Atom$n
Lemmasinheres wf, nat wf, atom-free-nat

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