Def if b t else f fi == InjCase(b ; t; f)

is mentioned by

Def filter(P;l) == reduce(a,v. if P(a) [a / v] else v fi;nil;l)

[filter]

In prior sections: bool 1 mb nat int 2 list 1

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