Nuprl Lemma : comb_for_rng_when_wf 6,26

(r,b,p,z. when b. p)  r:Rng|r|True|r| 
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Definitionst  T, Rng, T, x:A. B(x), Prop
Lemmasrng when wf, squash wf, true wf, rng car wf, bool wf, rng wf

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