Nuprl Lemma : es-rcv-atom_wf 11,40

es:ES, a:Atom1, e:E. e receives || a   
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Definitionse receives || a, P  Q, x:AB(x), , Type, b, isrcv(e), x:T||a, valtype(e), val(e), E, x:AB(x), Atom$n, t  T, ES
Lemmasevent system wf, es-E wf, es-val wf, es-valtype wf, free-from-atom wf1, es-isrcv wf, assert wf

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