l2 == 
l:T List. l2 = (l1 @ l)
T:Type, l1,l2:T List. l1 l2 
Prop
bs ; a.as' [a / (as' @ bs)] (recursive)T:Type, as,bs:T List. (as @ bs) T List| Who Cites iseg? | |
| iseg | Def l1 l2 == l:T List. l2 = (l1 @ l) |
| Thm* T:Type, l1,l2:T List. l1 l2 Prop | |
| 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 |
| Syntax: | l1 l2 | has structure: | iseg(T; l1; l2) |
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