| | Who Cites mapfilter? |
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| mapfilter | Def mapfilter(f;P;L) == map(f;filter(P;L)) |
| | | Thm*  T:Type, P:(T   ), T':Type, f:({x:T| P(x) }T'), L:T List. mapfilter(f;P;L)  T' List |
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| filter | Def filter(P;l) == reduce( a,v. if P(a) [a / v] else v fi;nil;l) |
| | | Thm* T:Type, P:(T), l:T List. filter(P;l) T List |
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| map | Def map(f;as) == Case of as; nil nil ; a.as' [(f(a)) / map(f;as')] (recursive) |
| | | Thm* A,B:Type, f:(AB), l:A List. map(f;l) B List |
| | | Thm* A,B:Type, f:(AB), l:A List . map(f;l) B List |
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| reduce | Def reduce(f;k;as) == Case of as; nil k ; a.as' f(a,reduce(f;k;as')) (recursive) |
| | | Thm* A,B:Type, f:(ABB), k:B, as:A List. reduce(f;k;as) B |
