Nuprl Lemma : sender-f-free 11,40

es:ES, L:(Id List).
fischer(L)
 (e1:E, j:Id.
 Newround(e1)
  (j  L)
  ((j = loc(e1)))
  (sender(the rcv(free message from e1 to j)) = e1)) 
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Definitions, P & Q, IdLnk, t  T, P  Q, P  Q, "$x", the rcv(free message from e1 to j), P  Q, Id, x:AB(x), False, if b then t else f fi , ff, eq_atom$n(x;y), Atom2Deq, IdDeq, t.1, eqof(d), a = b, x:AB(x), b, xLP(x), P  Q, A c B, Newround(e), fischer(L)
Lemmasevent system wf, fischer wf, f-newround wf, l member wf, es-loc wf, Id wf, not wf, assert-eq-id, es-sender-first-from, es-E wf

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