bs ; a.as' [a / (as' @ bs)] (recursive)
T:Type, as,bs:T List. (as @ bs) 
T List
Q == (P 
Q) & (P Q)A,B:Prop. (A B) Prop l == [x; y] 
lT:Type, l:T List, x,y:T. x before y 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 | |
| iff | Def P Q == (P Q) & (P Q) |
| Thm* A,B:Prop. (A B) Prop | |
| l_before | Def x before y l == [x; y] l |
| Thm* T:Type, l:T List, x,y:T. x before y l Prop |
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