is mentioned by

Def @i: only L affects x : t(j) Def == if eqof(IdDeq)(j,i) only members of L affect x :t else  fi

[d-single-frame]

In prior sections: mb event system 4

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