Who Cites array el?
array_el	Def a[i] == 2of(2of(a))(i)
	Thm* T:Type, i:, j:{i...}, a:[T]Array{i..j}, k:{i..j}. a[k]  T
	Thm* T:Type, a:[T]Array , i:{a.l..a.u}. a[i]  T
pi2	Def 2of(t) == t.2
	Thm* A:Type, B:(AType), p:(a:AB(a)). 2of(p)  B(1of(p))

Syntax:

a[i]

has structure:

array_el(a; i)

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