Some definitions of interest.
da-outlinks	Def da-outlinks(da;i) Def == mapfilter(k.da-outlink-f(da;k);k.has-src(i;k);fpf-dom-list(da))
Kind-deq	Def KindDeq == union-deq(IdLnkId;Id;product-deq(IdLnk;Id;IdLnkDeq;IdDeq);IdDeq)
Knd	Def Knd == (IdLnkId)+Id
	Thm* Knd  Type
IdLnk	Def IdLnk == IdId
	Thm* IdLnk  Type
Id	Def Id == Atom
	Thm* Id  Type
fpf	Def a:A fp-> B(a) == d:A Lista:{a:A| (a  d) }B(a)
	Thm* A:Type, B:(AType). a:A fp-> B(a)  Type
fpf-join	Def f  g == <1of(f) @ filter(a.a  dom(f);1of(g)),a.f(a)?g(a)>
l_member	Def (x  l) == i:. i<||l|| & x = l[i]  T
	Thm* T:Type, x:T, l:T List. (x  l)  Prop
top	Def Top == Void given Void
	Thm* Top  Type

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