IF YOU CAN SEE THIS go to http://www.cs.cornell.edu/Info/People/sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
coprime bezout id0 a,b:. CoPrime(a,b) (x,y:. (ax+by) ~ 1)
By:
RepD THEN (Unfold `coprime` -1)
THEN
(Inst Thm*a,b:. u,v:. GCD(a;b;ua+vb) [b;a])
THEN
ExRepD