| Who Cites honto? |
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honto | Def onto == f:'a 'b.  onto('a;'b;f) |
| | Thm* 'a,'b:S. onto (('a  'b)  hbool) |
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onto | Def onto('a;'b;f) == y:'b. x:'a. y = f(x) |
| | Thm* 'a,'b:Type, f:('a 'b). onto('a;'b;f) Prop |
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prop_to_bool | Def  P == InjCase(lem(P) ; true ; false ) |
| | Thm* P:Prop. ( P)  |
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tlambda | Def ( x:T. b(x))(x) == b(x) |