mb event system 7 Sections EventSystems Doc
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Def 1of(t) == t.1

is mentioned by

Thm* k:Knd, l:IdLnk, ds:x:Id fp-> Type, da:a:Knd fp-> Type, f:(IdTop) List,
Thm* l1:IdLnk, tg:Id, L:Knd List.
Thm* (l = l1  (tg  map(p.1of(p);f))  (k  L))
Thm* 
Thm* ma-single-sends(dsdaklf) ||+ only L sends on (l1 with tg)
[ma-single-sends-ma-single-sframe-compatible]

In prior sections: core mb list 1 mb event system 5 mb event system 6 mb event system 1 mb event system 2 mb event system 3 mb event system 4

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mb event system 7 Sections EventSystems Doc