Nuprl - Some Definitions

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	Some definitions of interest.

array	Def [T]Array == n:m:{n...}{n..m}T

	Thm* T:Type{i}. [T]Array Type{[i']}

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

array_lb	Def a.l == 1of(a)

	Thm* T:Type, a:[T]Array . a.l

array_ub	Def a.u == 1of(2of(a))

	Thm* T:Type, a:[T]Array . a.u

int_seg	Def {i..j} == {k:\| i k < j }

	Thm* m,n:. {m..n} Type

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