mb event system 7 Sections EventSystems Doc
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Def M1 ||decl M2 == 1of(M1) || 1of(M2) & 1of(2of(M1)) || 1of(2of(M2))

is mentioned

In prior sections: mb event system 5 mb event system 4

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

mb event system 7 Sections EventSystems Doc