Some definitions of interest.
dsys	Def Dsys == IdMsgA
	Thm* Dsys  Type{i'}
ma-decla	Def a declared in M == locl(a)  dom(1of(2of(M)))
Id	Def Id == Atom
	Thm* Id  Type
d-m	Def M(i) == D(i)
decidable	Def Dec(P) == P  P
	Thm* A:Prop. Dec(A)  Prop

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