Who Cites iff?
iff	Def P  Q == (P  Q) & (P  Q)
	Thm* A,B:Prop. (A  B)  Prop
rev_implies	Def P  Q == Q  P
	Thm* A,B:Prop. (A  B)  Prop

Syntax:

P  Q

has structure:

iff(P; Q)

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