NuprlPrimitives Sections NuprlLIB Doc
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Def sexprCar(s) == Case of s :  Inj(x Inj(x) ; Cons(s1;s2 s1

is mentioned by

Thm* s:Sexpr(A). Size(s 1    Size(sexprCar(s))<Size(s)[sfa_doc_sexprcarsize]

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NuprlPrimitives Sections NuprlLIB Doc