Def   x:A st P(x). Q(x) == x:A. P(x)  Q(x)

is mentioned by

Thm*  (q:A/E{x:A| q = x  A/E }) ~ A

[card_quotient]

In prior sections: LogicSupplement

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