Def first(e)
Def == if time(e)=0 true
Def == i; isnull(a(loc(e);time(e)-1)) first(<loc(e),time(e)-1>)
Def == else false fi
Def (recursive)

is mentioned

In prior sections: mb event system 3

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