| | Some definitions of interest. |
|
| hhd | Def hd ==  l:'a List. if null(l) then arb('a) else head(l) fi |
| | | Thm*  'a:S. hd  (hlist('a)   'a) |
|
| head | Def head(l) == hd(l) |
| | | Thm* 'a:Type, l:'a List.  mt(l)   head(l) 'a |
|
| hlist | Def hlist('a) == 'a List |
| | | Thm* 'a:S. hlist('a) S |
|
| mt | Def mt(l) == Case of l; nil  True ; a.as' False |
| | | Thm* 'a:Type{i}, l:'a List. mt(l) Prop{1} |
|
| not | Def A == A False |
| | | Thm* A:Prop. (A) Prop |
|
| stype | Def S == {T:Type|  x:T. True } |
| | | Thm* S Type{2} |
|
| tl | Def tl(l) == Case of l; nil nil ; h.t t |
| | | Thm* A:Type, l:A List. tl(l) A List |
