Def P  Q == (P  Q) & (P  Q)

is mentioned by

Thm* (a1  a2)  (b1  b2)  (a1 & b1  a2 & b2)

[cand_functionality_wrt_iff]

In prior sections: core fun 1 well fnd int 1 bool 1 int 2 list 1

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