IF YOU CAN SEE THIS go to http://www.cs.cornell.edu/Info/People/sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
coprime bezout id1 a,b:. CoPrime(a,b) (x,y:. ax+by = 1)
By:
RepD THEN (FwdThru Thm*a,b:. CoPrime(a,b) (x,y:. (ax+by) ~ 1) [-1])
THEN
ExRepD