mb event system 5 Sections EventSystems Doc
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Def x : v == <[x],x.v>

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* B:(AType), x:Av:B(x), eqa:EqDecider(A). x : v  x : v[fpf-single-sub-reflexive]
Thm* eq:EqDecider(A), B:(AType), x,y:Av:B(x), u:B(y).
Thm* (x = y  v = u  B(x))  x : v || y : u
[fpf-compatible-singles]

In prior sections: mb event system 4

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mb event system 5 Sections EventSystems Doc