Def  == {i:| 0i }

is mentioned

In prior sections: int 1 bool 1 int 2 list 1 sqequal 1 mb nat mb list 1 num thy 1 mb list 2 mb event system 1 mb event system 2 mb event system 3 mb event system 5

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