Some definitions of interest.
ma-state	Def State(ds) == x:Idds(x)?Top
Id	Def Id == Atom
	Thm* Id  Type
deq	Def EqDecider(T) == eq:TTx,y:T. x = y  (eq(x,y))
	Thm* T:Type. EqDecider(T)  Type
eqof	Def eqof(d) == 1of(d)
	Thm* T:Type, d:EqDecider(T). eqof(d)  TT
fpf-single	Def x : v == <[x],x.v>

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