is mentioned by

Def a[i..j] == <i,j,2of(2of(a))>	[array_seg]
Def a[i] == 2of(2of(a))(i)	[array_el]
Def a.u == 1of(2of(a))	[array_ub]

In prior sections: core

Try larger context: StandardLIB IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html