Definitions int 2 Sections StandardLIB Doc
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
Some definitions of interest.
iffDef P  Q == (P  Q) & (P  Q)
Thm* A,B:Prop. (A  B Prop
ndiffDef a -- b == imax(a-b;0)
Thm* a,b:. (a -- b 
imaxDef imax(a;b) == if ab b else a fi
Thm* a,b:. imax(a;b 
leDef AB == B<A
Thm* i,j:. (ij Prop

About:
ifthenelseintnatural_numbersubtractless_than
memberpropimpliesandall
!abstraction
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

Definitions int 2 Sections StandardLIB Doc