Who Cites array seg?
array_seg	Def a[i..j] == <i,j,2of(2of(a))>
	Thm* T:Type, i:, j:{i...}, a:[T]Array{i..j}, m:{i..j}, n:{m..j}. Thm* a[m..n]  [T]Array{m..n}
pi2	Def 2of(t) == t.2
	Thm* A:Type, B:(AType), p:(a:AB(a)). 2of(p)  B(1of(p))

Syntax:

a[i..j]

has structure:

array_seg(a; i; j)

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