WhoCites Definitions array 1 Sections StandardLIB Doc
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Who Cites array ub?
array_ubDef a.u == 1of(2of(a))
Thm* T:Type, a:[T]Array . a.u  
pi2Def 2of(t) == t.2
Thm* A:Type, B:(AType), p:(a:AB(a)). 2of(p B(1of(p))
pi1Def 1of(t) == t.1
Thm* A:Type, B:(AType), p:(a:AB(a)). 1of(p A

Syntax:a.u has structure: array_ub(a)

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WhoCites Definitions array 1 Sections StandardLIB Doc