mb event system 5 Sections EventSystems Doc
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Def tag(k) == 2of(outl(k))

is mentioned by

Thm* ltg:(IdLnkIdType), i:Id, k:Knd, T:Type.
Thm* (ltg  da-outlinks(k : T;i))
Thm* 
Thm* isrcv(k) & source(lnk(k)) = i
Thm* & (1of(ltg) ~ lnk(k))
Thm* & (1of(2of(ltg)) ~ tag(k))
Thm* & 2of(2of(ltg)) = T
[da-outlinks-single]

In prior sections: mb event system 2 mb event system 3 mb event system 4

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mb event system 5 Sections EventSystems Doc