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Who Cites honto?
hontoDef onto == f:'a'bonto('a;'b;f)
Thm* 'a,'b:S. onto  (('a  'b hbool)
ontoDef onto('a;'b;f) == y:'bx:'ay = f(x)
Thm* 'a,'b:Type, f:('a'b). onto('a;'b;f Prop
prop_to_boolDef P == InjCase(lem(P) ; true; false)
Thm* P:Prop. (P 
tlambdaDef (x:Tb(x))(x) == b(x)

Syntax:onto has structure: honto('a'b)

About:
boolbfalsebtruedecideapplyfunction
universeequalmemberpropallexists!abstraction
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WhoCites Definitions hol num Sections HOLlib Doc