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

is mentioned by

Def  Q(x) ==  x:A st P(x). Q(x)

[allst_implicit]

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