Def  b == if b True else False fi

is mentioned by

Thm*  i,j,k:. i  j < k  i  j < k

[lelt_int_vs_lelt]

In prior sections: bool 1 quot 1 LogicSupplement union SimpleMulFacts rel 1

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