Nuprl Lemma : w-time_wf 11,40

the_w:World, e:E. time(e)   
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Definitionsx:A. B(x), E, t  T, time(e), x. t(x), x(s),
Lemmaspi2 wf, Id wf, nat wf, not wf, assert wf, w-isnull wf, pi1 wf, w-a wf, world wf

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