Nuprl Lemma : csinput?_wf 11,40

Cmd:Type, x:chain_sys(Cmd). csinput?(x)   
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Definitionsx,y. t(x;y), x. t(x), csinput?(x), t  T, x:A. B(x), x(s1,s2), x(s)
Lemmaschain sys wf, Id wf, bfalse wf, btrue wf, bool wf, chain sys ind wf

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