Def b == if b True else False fi

is mentioned by

Def IsEqFun(T;eq) == x,y:T. (x eq y)  x = y

[eqfun_p]

In prior sections: bool 1

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