Some definitions of interest.
Id	Def Id == Atom
	Thm* Id  Type
fpf-cap	Def f(x)?z == if x  dom(f) f(x) else z fi
fpf-single	Def x : v == <[x],x.v>
id-deq	Def IdDeq == product-deq(Atom;;AtomDeq;NatDeq)
top	Def Top == Void given Void
	Thm* Top  Type

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