Nuprl Lemma : decidable__assert 9,38
b:. Dec(b) 
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ProofTree

Definitionst  T, Dec(P), x:A. B(x), P  Q, Unit, , ff, tt, ,
Lemmasbool wf, btrue wf, assert wf, not wf, assert of tt, bfalse wf, assert of ff

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