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Basic Characteristics u b.  _  

u b. y gives the linear representation of the obverse of u if y is _1; its ranks if y is 0; and the linear representation of the identity function if y is 1 .
 		    
 

For example:
   ^ b. _1
^.

   ^ b. 0
0 0 0

   ^ b. 1
$&1@(}.@$)

   g=: +&2@(*&3@*:)
   ]y=: g 5
77

   g ^:_1 y
5

   g b. _1
%:@(%&3)@(-&2)

   %:@(%&3)@(-&2) y
5

   g b. 0
0 0 0
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