NuprlPrimitives Sections NuprlLIB Doc
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Def i even == 0=(i rem 2)

is mentioned by

Thm* f,g:().
Thm* (x:f zero beyond x) & (x:g zero beyond x)
Thm* 
Thm* (x:. (i.if i even f(i) else g(i) fi) zero beyond x)
[sfa_doc_alternate_zero_beyond]

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NuprlPrimitives Sections NuprlLIB Doc