== {l:(T*)| ||l|| > 0 }
Thm* 
T:Type. (T List) 
Type
0 ; a.as' ||as'||+1 (recursive)
Thm* A:Type, l:A*. ||l|| 
Thm* ||nil||
Thm* i,j:. i > j Prop
| list_p |
Def T List == {l:(T*)| ||l|| > 0 }
Thm* |
| length |
Def ||as|| == Case of as; nil 0 ; a.as' ||as'||+1 (recursive)
Thm*
Thm* ||nil|| |
| gt |
Def i > j == j < i
Thm* |
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