0 ; a.as' ||as'||+1 (recursive)
A:Type, l:A List. ||l|| 
T:Type, L:T List. ||L|| 
| Who Cites length? | |
| length | Def ||as|| == Case of as; nil 0 ; a.as' ||as'||+1 (recursive) |
| Thm* A:Type, l:A List. ||l|| | |
| Thm* ||nil|| | |
| Thm* T:Type, L:T List. ||L|| |
| Syntax: | ||as|| | has structure: | length(as) |
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