Nuprl Lemma : es-lc_wf 11,40

T:Type, eq:EqDecider(T), es:ES, x:Id, e:{e:E| @loc(e)(x:T)} . lastchange(x;e E 
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Definitions, ff, P  Q, P & Q, P  Q, tt, P  Q, if b then t else f fi , lastchange(x;e), t  T, EqDecider(T), x:AB(x), Unit, ,
Lemmasiff wf, event system wf, Id wf, es-loc wf, es-dtype wf, es-E wf, assert of bnot, eqff to assert, not wf, bnot wf, assert wf, iff transitivity, last-change wf, eqtt to assert, bool wf, changed wf

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