Some definitions of interest.
comment	Def  Kind of comment: $kind == a
eq_int	Def  i=j == if i=j true ; false fi
	Thm*  i,j:. (i=j)
fun_over_st	Def  x:A st P(x)B(x) == x:{x:A| P(x) }B(x)
int_seg	Def  {i..j} == {k:| i  k < j }
	Thm*  m,n:. {m..n}  Type
not	Def  A == A  False
	Thm*  A:Prop. (A)  Prop

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