Def  == {i:| 0<i }

is mentioned by

Def R^+(x,y) == n:. x R^n y

[rel_plus]

In prior sections: int 1 int 2 mb nat num thy 1

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