NuprlPrimitives Sections NuprlLIB Doc
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Def l[i] == hd(nth_tl(i;l))

is mentioned by

Thm* as:T List. (i.as[i]){||as||} = as[sfa_doc_listify_select_id]
Def y greater-bounds x == i:||x||. x[i]<y[sfa_doc_greater_list_bound]

In prior sections: list 1

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NuprlPrimitives Sections NuprlLIB Doc