Def ||as|| == Case of as; nil  0 ; a.as'  ||as'||+1  (recursive)

is mentioned

In prior sections: list 1 mb basic mb nat mb list 1 mb list 2 mb event system 1 mb event system 2 mb event system 3

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