mb event system 4 Sections EventSystems Doc
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Def isrcv(k) == isl(k)

is mentioned

In prior sections: 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

mb event system 4 Sections EventSystems Doc