bs ; a.as' [a / (as' @ bs)] (recursive)
T:Type, as,bs:T List. (as @ bs) 
T List l) == 
i:
. i < ||l|| & x = l[i] TT:Type, x:T, l:T List. (x l) Prop| 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 | |
| l_member | Def (x l) == i:. i < ||l|| & x = l[i] T |
| Thm* T:Type, x:T, l:T List. (x l) Prop |
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