Definitions array 1 Sections StandardLIB Doc
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Some definitions of interest.
arrayDef [T]Array  == n:m:{n...}{n..m}T
Thm* T:Type{i}. [T]Array   Type{[i']}
array_lbDef a.l == 1of(a)
Thm* T:Type, a:[T]Array . a.l  
array_ubDef a.u == 1of(2of(a))
Thm* T:Type, a:[T]Array . a.u  
int_upperDef {i...} == {j:ij }
Thm* n:. {n...}  Type

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Definitions array 1 Sections StandardLIB Doc