Who Cites hisr?
hisr	Def isr == u:'a+'b. isr(u)
	Thm* 'a,'b:S. isr  (hsum('a; 'b)  hbool)
isr	Def isr(x) == InjCase(x; y. false; z. true)
	Thm* A,B:Type, x:A+B. isr(x)
tlambda	Def (x:T. b(x))(x) == b(x)

Syntax:

isr

has structure:

hisr('a; 'b)

About: IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html