Some definitions of interest.
w-Msg	Def Msg == Msg(w.M)
world	Def World Def == T:IdIdType Def == TA:IdIdType Def == M:IdLnkIdType Def == (i:Id(x:IdT(i,x)))(i:Idaction(w-action-dec(TA;M;i))) Def == (i:Id({m:Msg(M)| source(mlnk(m)) = i } List))Top
	Thm* World  Type{i'}
IdLnk	Def IdLnk == IdId
	Thm* IdLnk  Type
w-ml	Def m(l;t) == onlnk(l;m(source(l);t))
nat	Def  == {i:| 0i }
	Thm*   Type

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