| Some definitions of interest. |
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head | Def head(l) == hd(l) |
| | Thm* 'a:Type, l:'a List. mt(l)  head(l) 'a |
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label | Def t ...$L == t |
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mt | Def mt(l) == Case of l; nil True ; a.as' False |
| | Thm* 'a:Type{i}, l:'a List. mt(l) Prop{1} |
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not | Def A == A  False |
| | Thm* A:Prop. ( A) Prop |