Who Cites existse-at?
existse-at	Def e@i.P(e) == e:E. loc(e) = i  Id & P(e)
es-loc	Def loc(e) == 1of(2of(2of(2of(2of(2of(2of(es)))))))(e)
Id	Def Id == Atom
	Thm* Id  Type
es-E	Def E == 1of(es)
pi2	Def 2of(t) == t.2
	Thm* A:Type, B:(AType), p:(a:AB(a)). 2of(p)  B(1of(p))
pi1	Def 1of(t) == t.1
	Thm* A:Type, B:(AType), p:(a:AB(a)). 1of(p)  A
nat	Def  == {i:| 0i }
	Thm*   Type
le	Def AB == B<A
	Thm* i,j:. (ij)  Prop
not	Def A == A  False
	Thm* A:Prop. (A)  Prop

Syntax:

e@i.P(e)

has structure:

existse-at(es; i; e.P(e))

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