mb event system 5 Sections EventSystems Doc
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Def isrcv(k) == isl(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]
Thm* da:k:Knd fp-> Type, k:{k:Knd| k  dom(da) & isrcv(k) }.
Thm* da-outlink-f(da;k IdLnkIdType
[da-outlink-f_wf]

In prior sections: mb event system 1 mb event system 2 mb event system 3

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mb event system 5 Sections EventSystems Doc