IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
This fact is also a special case of
Ob Not Found: nsub_inj_factoid
as is exploited in the proof nsub inj factorial of the same fact.
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html