mb event system 6 Sections EventSystems Doc
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Def @i: only L affects x : t(j)
Def == if eqof(IdDeq)(j,i) only members of L affect x :t else  fi

is mentioned by

Thm* i:Id, L:Knd List, x:Id, T:Type.
Thm* @i: only L affects x : T 
Thm* realizes es.(vartype(i;xT)
Thm* realizes es.& (e:E. 
Thm* realizes es.& (loc(e) = i  Id
Thm* realizes es.& (
Thm* realizes es.& (((x after e) = (x when e T  (kind(e L))
Thm* realizes es.& (& ((kind(e L (x after e) = (x when e T))
[frame-rule]

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mb event system 6 Sections EventSystems Doc