mb event system 3 Sections EventSystems Doc
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Def (Msg on l) == {m:Msg| haslink(lm) }

is mentioned by

Thm* the_es:ES, e:E, l:IdLnk, tg:Id. sends(l,tg,e (Msg on l) List[es-tg-sends_wf]

In prior sections: mb event system 2

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mb event system 3 Sections EventSystems Doc