bs ; a.as' [a / (as' @ bs)] (recursive)
T:Type, as,bs:T List. (as @ bs) 
T List
x.outl(x);x.isl(x);s)A,B:Type, s:(A+B) List. mapoutl(s) A List| Some definitions of interest. | |
| append | Def as @ bs == Case of as; nil bs ; a.as' [a / (as' @ bs)] (recursive) |
| Thm* T:Type, as,bs:T List. (as @ bs) T List | |
| mapoutl | Def mapoutl(s) == mapfilter(x.outl(x);x.isl(x);s) |
| Thm* A,B:Type, s:(A+B) List. mapoutl(s) A List |
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