IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
iso pair char1 'a,'b:S, P:('b), rep:('a'b), abs:('b'a).
iso_pair('a;'b;P;rep;abs)
(a:'a. abs(rep(a)) = a) & (r:'b. P(r) = ((rep(abs(r))) =r))
By:
Id THEN StrongAuto THEN Unab [`iso_pair`] THEN StrongAuto