Def  Dec(P) == P  P

is mentioned by

Thm*  x:. Dec(prime(x))

[decidable__prime]

In prior sections: core int 1 bool 1 rel 1 quot 1 LogicSupplement int 2 num thy 1

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