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

is mentioned

In prior sections: mb list 1 mb list 2 mb event system 1 mb event system 3 mb event system 4

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