Nuprl Lemma : es-change-to_wf 11,40

es:event_system{i:l}, T:Type, x:Id, v:Te:es-E(es). @e(xv prop{i:l} 
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DefinitionsP  Q, es-dtype(esixT), A c B, @e(xv), prop{i:l}, t  T, x:AB(x)
Lemmasevent system wf, Id wf, es-E wf, es-after wf, es-when wf, not wf, es-vartype wf, es-isconst wf, assert wf

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