Some definitions of interest.
pi1	Def 1of(t) == t.1
	Thm* A:Type, B:(AType), p:(a:AB(a)). 1of(p)  A
pi2	Def 2of(t) == t.2
	Thm* A:Type, B:(AType), p:(a:AB(a)). 2of(p)  B(1of(p))
stype	Def S == {T:Type| x:T. True }
	Thm* S  Type{2}

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