is mentioned by

Def mtag(m) == 1of(2of(m))	[mtag]
Def lnk-inv(l) == <1of(2of(l)),1of(l),2of(2of(l))>	[lnk-inv]

In prior sections: core mb list 1

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