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Who Cites hisl?
hislDef isl == u:'a+'b. isl(u)
Thm* 'a,'b:S. isl  (hsum('a'b hbool)
islDef isl(x) == InjCase(xy. truez. false)
Thm* A,B:Type, x:A+B. isl(x 
tlambdaDef (x:Tb(x))(x) == b(x)

Syntax:isl has structure: hisl('a'b)

About:
boolbfalsebtrueuniondecide
applyuniversememberall!abstraction
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WhoCites Definitions HOLlib Sections NuprlLIB Doc