IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
delete fenum value is fenum gen121 1. P : Prop
2. Q : Prop
3. f : {u:| P(u) }{v:| Q(v) }
4. Inj({u:| P(u) }; {v:| Q(v) }; f)
5. Surj({u:| P(u) }; {v:| Q(v) }; f)
6. m : {u:| P(u) }
7. k : {v:| Q(v) }
8. (Replace value k by f(m) in f) {u:| P(u) & u = m }{v:| Q(v) & v = k }
9. b : {v:| Q(v) & v = k }
a:{u:| P(u) & u = m }. (Replace value k by f(m) in f)(a) = b
By:
Witness5: b THEN Analyze-1 THEN Witness5: k THEN New:c Analyze-1