| Who Cites hlength? |
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hlength | Def length == l:'a List. ||l|| |
| | Thm* 'a:S. length (hlist('a)  hnum) |
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length | Def ||as|| == Case of as; nil 0 ; a.as' ||as'||+1 (recursive) |
| | Thm* A:Type, l:A List. ||l||  |
| | Thm* ||nil||  |
| | Thm* 'a:Type, l:'a List. ||l||  |
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tlambda | Def ( x:T. b(x))(x) == b(x) |