Definitions | only L sends on (l with tg), @i: only L sends on (l with tg), IdLnk, @i: A, if b t else f fi, a = b, MsgA, , A & B, Dsys,  x. t(x), {T}, E, Id, loc(e), P  Q, Prop, A, b, null(as), (Msg on l), sends(l,tg,e), (x l), Knd, kind(e), ES, es is an event system of D, x:A. B(x), t T |