Def   == {i:| 0<i }

is mentioned by

Thm*  k:. k!

[factorial_via_iter_wf]

In prior sections: int 1 int 2 num thy 1 SimpleMulFacts

Try larger context: DiscrMathExt IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html