Some definitions of interest.
d-sub	Def D1  D2 == i:Id. M(i)  M(i)
dsys	Def Dsys == IdMsgA
	Thm* Dsys  Type{i'}
ma-sub	Def M1  M2 Def == 1of(M1)  1of(M2) & 1of(2of(M1))  1of(2of(M2)) Def == & 1of(2of(2of(M1)))  1of(2of(2of(M2))) Def == & & 1of(2of(2of(2of(M1))))  1of(2of(2of(2of(M2)))) Def == & & 1of(2of(2of(2of(2of(M1)))))  1of(2of(2of(2of(2of(M2))))) Def == & & 1of(2of(2of(2of(2of(2of(M1))))))  1of(2of(2of(2of(2of(2of(M2)))))) Def == & & 1of(2of(2of(2of(2of(2of(2of(M1)))))))  1of(2of(2of(2of(2of(2of(2of( Def == & & 1of(2of(2of(2of(2of(2of(2of(M1)))))))  1of(M2))))))) Def == & & 1of(2of(2of(2of(2of(2of(2of(2of( Def == & & 1of(M1))))))))  1of(2of(2of(2of(2of(2of(2of(2of(M2))))))))
Id	Def Id == Atom
	Thm* Id  Type
d-m	Def M(i) == D(i)

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