Definitions mb nat Sections MarkB generic Doc
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
Some definitions of interest.
fappendDef f[n:=x](i) == if i=n x else f(i) fi
Thm* n,m:f:(nm), x:mf[n:=x (n+1)m
int_segDef {i..j} == {k:i  k < j }
Thm* m,n:. {m..n Type
natDef  == {i:| 0i }
Thm*   Type

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

Definitions mb nat Sections MarkB generic Doc