Def mu(f) == if f(0) 0 else mu(x.f(x+1))+1 fi  (recursive)

is mentioned by

Def sender(e) == <source(lnk(kind(e))),mu(t.match(lnk(kind(e));t;time(e)))>

[w-sender]

In prior sections: mb event system 1

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