Def P  Q == (P  Q) & (P  Q)

is mentioned by

Thm* (f:(AB). Bij(A; B; f))  (A ~~ B)

[bij_iff_1_1_corr]

In prior sections: core

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