IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
hrep prod wd1 1. 'a : S
2. 'b : S
rep_prod
=
(@rep:hprod('a; 'b) 'a'b hbool
(@((p',p'':hprod('a; 'b). ((rep(p')) = (rep(p'')))(p' =p'')) (@(x:'a'b hbool
(@(((is_pair(x)) = (p':hprod('a; 'b). (x = (rep(p'))))))))