Nuprl Lemma : es-isconst_wf 11,40

es:event_system{i:l}, i,x:Id. es-isconst(es; i; x)   
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DefinitionsId, t  T, x:A. B(x), f(a), es-isconst(es; i; x), x:A  B(x), event_system{i:l}, x:AB(x),
Lemmasevent system wf, Id wf

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