| Who Cites hexists? |
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hexists | Def exists == p:'a  .  x:'a. (p(x)) |
| | Thm* 'a:S. exists (('a  hbool)  hbool) |
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bexists | Def  x:T. P(x) ==  ( x:T. P(x)) |
| | Thm* T:Type, P:(T  ). ( x:T. P(x))  |
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tlambda | Def ( x:T. b(x))(x) == b(x) |
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assert | Def b == if b True else False fi |
| | Thm* b: . b Prop |
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prop_to_bool | Def  P == InjCase(lem(P) ; true ; false ) |
| | Thm* P:Prop. ( P)  |