Def  P  Q == (P  Q) & (P  Q)

is mentioned by

Thm*  a:. prime(a)  (x:. a | xx  a | x)

[prime_divides_square]

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

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